21662611208 has 64 divisors (see below), whose sum is σ = 49999488000. Its totient is φ = 8590784832.

The previous prime is 21662611169. The next prime is 21662611213. The reversal of 21662611208 is 80211626612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190988 + ... + 282491.

It is an arithmetic number, because the mean of its divisors is an integer number (781242000).

Almost surely, 2^21662611208 is an apocalyptic number.

21662611208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21662611208 is an abundant number, since it is smaller than the sum of its proper divisors (28336876792).

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

21662611208 is a wasteful number, since it uses less digits than its factorization.

21662611208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473554 (or 473550 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21662611208 in words is "twenty-one billion, six hundred sixty-two million, six hundred eleven thousand, two hundred eight".