21154654572 has 48 divisors (see below), whose sum is σ = 51525734400. Its totient is φ = 6747396480.

The previous prime is 21154654559. The next prime is 21154654607. The reversal of 21154654572 is 27545645112.

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, 286372 + ... + 352587.

It is an arithmetic number, because the mean of its divisors is an integer number (1073452800).

Almost surely, 2^21154654572 is an apocalyptic number.

It is an amenable number.

21154654572 is an abundant number, since it is smaller than the sum of its proper divisors (30371079828).

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

21154654572 is a wasteful number, since it uses less digits than its factorization.

21154654572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639086 (or 639084 counting only the distinct ones).

The product of its digits is 336000, while the sum is 42.

The spelling of 21154654572 in words is "twenty-one billion, one hundred fifty-four million, six hundred fifty-four thousand, five hundred seventy-two".