21321939524 has 24 divisors (see below), whose sum is σ = 37566661440. Its totient is φ = 10588664736.

The previous prime is 21321939521. The next prime is 21321939559. The reversal of 21321939524 is 42593912312.

It is a super-2 number, since 2×21321939524² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321939521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1928099 + ... + 1939125.

It is an arithmetic number, because the mean of its divisors is an integer number (1565277560).

Almost surely, 2^21321939524 is an apocalyptic number.

It is an amenable number.

21321939524 is a deficient number, since it is larger than the sum of its proper divisors (16244721916).

21321939524 is a wasteful number, since it uses less digits than its factorization.

21321939524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14267 (or 14265 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The spelling of 21321939524 in words is "twenty-one billion, three hundred twenty-one million, nine hundred thirty-nine thousand, five hundred twenty-four".