21219397524 has 96 divisors (see below), whose sum is σ = 62363280000. Its totient is φ = 6185403648.

The previous prime is 21219397519. The next prime is 21219397553. The reversal of 21219397524 is 42579391212.

21219397524 is a `hidden beast` number, since 21 + 2 + 19 + 3 + 97 + 524 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21219397524.

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 31 ways as a sum of consecutive naturals, for example, 371049 + ... + 424400.

It is an arithmetic number, because the mean of its divisors is an integer number (649617500).

Almost surely, 2^21219397524 is an apocalyptic number.

It is an amenable number.

21219397524 is an abundant number, since it is smaller than the sum of its proper divisors (41143882476).

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

21219397524 is a wasteful number, since it uses less digits than its factorization.

21219397524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795494 (or 795486 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 21219397524 in words is "twenty-one billion, two hundred nineteen million, three hundred ninety-seven thousand, five hundred twenty-four".