| Base | Representation |
|---|---|
| bin | 1001101001010011000110… |
| … | …01010001001001101110100 |
| 3 | 2210002200021011001121122200 |
| 4 | 10310221203022021031310 |
| 5 | 10240002003300024340 |
| 6 | 113035500435424500 |
| 7 | 4316246554155636 |
| oct | 464514312111564 |
| 9 | 83080234047580 |
| 10 | 21210212111220 |
| 11 | 6838222873470 |
| 12 | 2466821155130 |
| 13 | bab1644c39b2 |
| 14 | 534818b60a56 |
| 15 | 26bad637c330 |
| hex | 134a63289374 |
21210212111220 has 144 divisors (see below), whose sum is σ = 70236698313600. Its totient is φ = 5138193542400.
The previous prime is 21210212111113. The next prime is 21210212111227. The reversal of 21210212111220 is 2211121201212.
21210212111220 is a `hidden beast` number, since 2 + 1 + 210 + 21 + 211 + 1 + 220 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 21210212111193 and 21210212111202.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21210212111227) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1058511 + ... + 6598550.
It is an arithmetic number, because the mean of its divisors is an integer number (487754849400).
Almost surely, 221210212111220 is an apocalyptic number.
21210212111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21210212111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35118349156800).
21210212111220 is an abundant number, since it is smaller than the sum of its proper divisors (49026486202380).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21210212111220 is a wasteful number, since it uses less digits than its factorization.
21210212111220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7658486 (or 7658481 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 18.
Adding to 21210212111220 its reverse (2211121201212), we get a palindrome (23421333312432).
The spelling of 21210212111220 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".
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