21157616100 has 36 divisors (see below), whose sum is σ = 61216036784. Its totient is φ = 5642030880.

The previous prime is 21157616089. The next prime is 21157616141. The reversal of 21157616100 is 161675112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35262394 + ... + 35262993.

Almost surely, 2^21157616100 is an apocalyptic number.

21157616100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21157616100 is an abundant number, since it is smaller than the sum of its proper divisors (40058420684).

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

21157616100 is a wasteful number, since it uses less digits than its factorization.

21157616100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70525404 (or 70525397 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 21157616100 in words is "twenty-one billion, one hundred fifty-seven million, six hundred sixteen thousand, one hundred".