21688932912 has 40 divisors (see below), whose sum is σ = 57544065456. Its totient is φ = 7034247936.

The previous prime is 21688932869. The next prime is 21688932913. The reversal of 21688932912 is 21923988612.

It is a super-2 number, since 2×21688932912² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21688932913) 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, 6104343 + ... + 6107894.

Almost surely, 2^21688932912 is an apocalyptic number.

It is an amenable number.

21688932912 is an abundant number, since it is smaller than the sum of its proper divisors (35855132544).

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

21688932912 is a wasteful number, since it uses less digits than its factorization.

21688932912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212285 (or 12212279 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The spelling of 21688932912 in words is "twenty-one billion, six hundred eighty-eight million, nine hundred thirty-two thousand, nine hundred twelve".