21872630808 has 96 divisors (see below), whose sum is σ = 69530816160. Its totient is φ = 6080417280.

The previous prime is 21872630789. The next prime is 21872630839. The reversal of 21872630808 is 80803627812.

21872630808 is a `hidden beast` number, since 2 + 1 + 8 + 7 + 2 + 630 + 8 + 0 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 567813 + ... + 605108.

It is an arithmetic number, because the mean of its divisors is an integer number (724279335).

Almost surely, 2^21872630808 is an apocalyptic number.

21872630808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21872630808 is an abundant number, since it is smaller than the sum of its proper divisors (47658185352).

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

21872630808 is a wasteful number, since it uses less digits than its factorization.

21872630808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172977 (or 1172970 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 21872630808 in words is "twenty-one billion, eight hundred seventy-two million, six hundred thirty thousand, eight hundred eight".