21102133100 has 18 divisors (see below), whose sum is σ = 45791629044. Its totient is φ = 8440853200.

The previous prime is 21102133067. The next prime is 21102133123. The reversal of 21102133100 is 133120112.

It is a super-2 number, since 2×21102133100² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105510566 + ... + 105510765.

Almost surely, 2^21102133100 is an apocalyptic number.

21102133100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102133100 is an abundant number, since it is smaller than the sum of its proper divisors (24689495944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102133100 is a wasteful number, since it uses less digits than its factorization.

21102133100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211021345 (or 211021338 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21102133100 its reverse (133120112), we get a palindrome (21235253212).

The spelling of 21102133100 in words is "twenty-one billion, one hundred two million, one hundred thirty-three thousand, one hundred".