21272724636 has 48 divisors (see below), whose sum is σ = 50464663200. Its totient is φ = 6973523200.

The previous prime is 21272724617. The next prime is 21272724689. The reversal of 21272724636 is 63642727212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121690 + ... + 239486.

It is an arithmetic number, because the mean of its divisors is an integer number (1051347150).

Almost surely, 2^21272724636 is an apocalyptic number.

It is an amenable number.

21272724636 is an abundant number, since it is smaller than the sum of its proper divisors (29191938564).

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

21272724636 is a wasteful number, since it uses less digits than its factorization.

21272724636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118054 (or 118052 counting only the distinct ones).

The product of its digits is 338688, while the sum is 42.

The spelling of 21272724636 in words is "twenty-one billion, two hundred seventy-two million, seven hundred twenty-four thousand, six hundred thirty-six".