21623788912 has 20 divisors (see below), whose sum is σ = 45704826936. Its totient is φ = 9828994880.

The previous prime is 21623788883. The next prime is 21623788933. The reversal of 21623788912 is 21988732612.

It is a super-3 number, since 3×21623788912³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61431043 + ... + 61431394.

Almost surely, 2^21623788912 is an apocalyptic number.

21623788912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21623788912 is an abundant number, since it is smaller than the sum of its proper divisors (24081038024).

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

21623788912 is a wasteful number, since it uses less digits than its factorization.

21623788912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122862456 (or 122862450 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The spelling of 21623788912 in words is "twenty-one billion, six hundred twenty-three million, seven hundred eighty-eight thousand, nine hundred twelve".