21207592110 has 16 divisors (see below), whose sum is σ = 50898221136. Its totient is φ = 5655357888.

The previous prime is 21207592097. The next prime is 21207592127. The reversal of 21207592110 is 1129570212.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 706919737 = 21207592110 / (2 + 1 + 2 + 0 + 7 + 5 + 9 + 2 + 1 + 1 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353459839 + ... + 353459898.

It is an arithmetic number, because the mean of its divisors is an integer number (3181138821).

Almost surely, 2^21207592110 is an apocalyptic number.

21207592110 is an abundant number, since it is smaller than the sum of its proper divisors (29690629026).

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

21207592110 is a wasteful number, since it uses less digits than its factorization.

21207592110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706919747.

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

The spelling of 21207592110 in words is "twenty-one billion, two hundred seven million, five hundred ninety-two thousand, one hundred ten".