21407636100 has 36 divisors (see below), whose sum is σ = 61939427984. Its totient is φ = 5708702880.

The previous prime is 21407636021. The next prime is 21407636111. The reversal of 21407636100 is 163670412.

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

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, 35679094 + ... + 35679693.

Almost surely, 2^21407636100 is an apocalyptic number.

21407636100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21407636100 is an abundant number, since it is smaller than the sum of its proper divisors (40531791884).

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

21407636100 is a wasteful number, since it uses less digits than its factorization.

21407636100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71358804 (or 71358797 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 21407636100 in words is "twenty-one billion, four hundred seven million, six hundred thirty-six thousand, one hundred".