21669071620 has 24 divisors (see below), whose sum is σ = 52005772224. Its totient is φ = 7429395936.

The previous prime is 21669071609. The next prime is 21669071623. The reversal of 21669071620 is 2617096612.

It is not an unprimeable number, because it can be changed into a prime (21669071623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77389402 + ... + 77389681.

It is an arithmetic number, because the mean of its divisors is an integer number (2166907176).

Almost surely, 2^21669071620 is an apocalyptic number.

21669071620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21669071620 is an abundant number, since it is smaller than the sum of its proper divisors (30336700604).

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

21669071620 is a wasteful number, since it uses less digits than its factorization.

21669071620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154779099 (or 154779097 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 21669071620 in words is "twenty-one billion, six hundred sixty-nine million, seventy-one thousand, six hundred twenty".