21364557612 has 48 divisors (see below), whose sum is σ = 51571803360. Its totient is φ = 6878449152.

The previous prime is 21364557551. The next prime is 21364557623. The reversal of 21364557612 is 21675546312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114787 + ... + 236442.

It is an arithmetic number, because the mean of its divisors is an integer number (1074412570).

Almost surely, 2^21364557612 is an apocalyptic number.

It is an amenable number.

21364557612 is an abundant number, since it is smaller than the sum of its proper divisors (30207245748).

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

21364557612 is a wasteful number, since it uses less digits than its factorization.

21364557612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351410 (or 351408 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The spelling of 21364557612 in words is "twenty-one billion, three hundred sixty-four million, five hundred fifty-seven thousand, six hundred twelve".