| Base | Representation |
|---|---|
| bin | 1001100011001111011110… |
| … | …10111011100100011001100 |
| 3 | 2202100210010020010101212010 |
| 4 | 10301213233113130203030 |
| 5 | 10223044310404323040 |
| 6 | 112400123034541220 |
| 7 | 4265231614044666 |
| oct | 461475727344314 |
| 9 | 82323106111763 |
| 10 | 21002111011020 |
| 11 | 6767a44161837 |
| 12 | 2432424597810 |
| 13 | b9464ba24209 |
| 14 | 528716bb9536 |
| 15 | 2664a6adbe80 |
| hex | 1319ef5dc8cc |
21002111011020 has 96 divisors (see below), whose sum is σ = 59824637853120. Its totient is φ = 5503709352960.
The previous prime is 21002111010997. The next prime is 21002111011043. The reversal of 21002111011020 is 2011011120012.
It is an interprime number because it is at equal distance from previous prime (21002111010997) and next prime (21002111011043).
It is a super-2 number, since 2×210021110110202 (a number of 27 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a junction number, because it is equal to n+sod(n) for n = 21002111010987 and 21002111011005.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1375366 + ... + 6625394.
It is an arithmetic number, because the mean of its divisors is an integer number (623173310970).
Almost surely, 221002111011020 is an apocalyptic number.
21002111011020 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 21002111011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29912318926560).
21002111011020 is an abundant number, since it is smaller than the sum of its proper divisors (38822526842100).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21002111011020 is a wasteful number, since it uses less digits than its factorization.
21002111011020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5251195 (or 5251193 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 12.
Adding to 21002111011020 its reverse (2011011120012), we get a palindrome (23013122131032).
The spelling of 21002111011020 in words is "twenty-one trillion, two billion, one hundred eleven million, eleven thousand, twenty".
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