21655012592 has 40 divisors (see below), whose sum is σ = 42970583040. Its totient is φ = 10566279360.

The previous prime is 21655012571. The next prime is 21655012609. The reversal of 21655012592 is 29521055612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792209 + ... + 819087.

It is an arithmetic number, because the mean of its divisors is an integer number (1074264576).

Almost surely, 2^21655012592 is an apocalyptic number.

It is an amenable number.

21655012592 is a deficient number, since it is larger than the sum of its proper divisors (21315570448).

21655012592 is a wasteful number, since it uses less digits than its factorization.

21655012592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28101 (or 28095 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 21655012592 in words is "twenty-one billion, six hundred fifty-five million, twelve thousand, five hundred ninety-two".