21513156272 has 40 divisors (see below), whose sum is σ = 42824248656. Its totient is φ = 10461954816.

The previous prime is 21513156233. The next prime is 21513156293. The reversal of 21513156272 is 27265131512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2171843 + ... + 2181725.

Almost surely, 2^21513156272 is an apocalyptic number.

It is an amenable number.

21513156272 is a deficient number, since it is larger than the sum of its proper divisors (21311092384).

21513156272 is a wasteful number, since it uses less digits than its factorization.

21513156272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13605 (or 13599 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

Adding to 21513156272 its reverse (27265131512), we get a palindrome (48778287784).

The spelling of 21513156272 in words is "twenty-one billion, five hundred thirteen million, one hundred fifty-six thousand, two hundred seventy-two".