| Base | Representation |
|---|---|
| bin | 10000001010111001111… |
| … | …111111111001100000100 |
| 3 | 10221020020222110121000000 |
| 4 | 100022321333333030010 |
| 5 | 121201240330334340 |
| 6 | 2210253254321300 |
| 7 | 143166056120061 |
| oct | 20127177771404 |
| 9 | 3836228417000 |
| 10 | 1111222121220 |
| 11 | 3992a2a10842 |
| 12 | 15b442059230 |
| 13 | 80a31a339a3 |
| 14 | 3bad7a77c68 |
| 15 | 1dd8acb8d30 |
| hex | 102b9fff304 |
1111222121220 has 336 divisors, whose sum is σ = 3655371751920. Its totient is φ = 283264128000.
The previous prime is 1111222121189. The next prime is 1111222121263. The reversal of 1111222121220 is 221212221111.
1111222121220 is a `hidden beast` number, since 111 + 122 + 212 + 1 + 220 = 666.
It can be written as a sum of positive squares in 8 ways, for example, as 318495437316 + 792726683904 = 564354^2 + 890352^2 .
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 = 1111222121193 and 1111222121202.
It is an unprimeable number.
It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 42691810 + ... + 42717830.
It is an arithmetic number, because the mean of its divisors is an integer number (10879082595).
Almost surely, 21111222121220 is an apocalyptic number.
1111222121220 is a gapful number since it is divisible by the number (10) 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 1111222121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1827685875960).
1111222121220 is an abundant number, since it is smaller than the sum of its proper divisors (2544149630700).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1111222121220 is a wasteful number, since it uses less digits than its factorization.
1111222121220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 26178 (or 26161 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 18.
Adding to 1111222121220 its reverse (221212221111), we get a palindrome (1332434342331).
The spelling of 1111222121220 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".
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