21337455672 has 128 divisors (see below), whose sum is σ = 66605414400. Its totient is φ = 6279901056.

The previous prime is 21337455647. The next prime is 21337455683. The reversal of 21337455672 is 27655473312.

21337455672 is a `hidden beast` number, since 2 + 13 + 3 + 74 + 5 + 567 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100608 + ... + 229775.

It is an arithmetic number, because the mean of its divisors is an integer number (520354800).

Almost surely, 2^21337455672 is an apocalyptic number.

It is an amenable number.

21337455672 is an abundant number, since it is smaller than the sum of its proper divisors (45267958728).

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

21337455672 is a wasteful number, since it uses less digits than its factorization.

21337455672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330434 (or 330424 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 45.

The spelling of 21337455672 in words is "twenty-one billion, three hundred thirty-seven million, four hundred fifty-five thousand, six hundred seventy-two".