Base | Representation |
---|---|
bin | 10011110000110111… |
… | …110100000010100100 |
3 | 2000202221010010101212 |
4 | 103300313310002210 |
5 | 321430041011400 |
6 | 13425424210552 |
7 | 1350606540152 |
oct | 236067640244 |
9 | 60687103355 |
10 | 21221032100 |
11 | 8aaa7a0564 |
12 | 4142a69a58 |
13 | 2002654238 |
14 | 105452c3d2 |
15 | 84305d335 |
hex | 4f0df40a4 |
21221032100 has 36 divisors (see below), whose sum is σ = 46102338324. Its totient is φ = 8478698880.
The previous prime is 21221032097. The next prime is 21221032111. The reversal of 21221032100 is 123012212.
It is a happy number.
It can be written as a sum of positive squares in 6 ways, for example, as 77545636 + 21143486464 = 8806^2 + 145408^2 .
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33287 + ... + 208686.
It is an arithmetic number, because the mean of its divisors is an integer number (1280620509).
Almost surely, 221221032100 is an apocalyptic number.
21221032100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21221032100 is an abundant number, since it is smaller than the sum of its proper divisors (24881306224).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21221032100 is a wasteful number, since it uses less digits than its factorization.
21221032100 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 242864 (or 242857 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 14.
Adding to 21221032100 its reverse (123012212), we get a palindrome (21344044312).
The spelling of 21221032100 in words is "twenty-one billion, two hundred twenty-one million, thirty-two thousand, one hundred".
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