21596653764 has 81 divisors (see below), whose sum is σ = 63522600687. Its totient is φ = 6168709008.

The previous prime is 21596653703. The next prime is 21596653789. The reversal of 21596653764 is 46735669512.

The square root of 21596653764 is 146958.

It is a perfect power (a square), and thus also a powerful number.

21596653764 is a `hidden beast` number, since 2 + 15 + 96 + 6 + 537 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21596653764.

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 26 ways as a sum of consecutive naturals, for example, 6170487 + ... + 6173985.

Almost surely, 2^21596653764 is an apocalyptic number.

21596653764 is the 146958-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21596653764

21596653764 is an abundant number, since it is smaller than the sum of its proper divisors (41925946923).

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

21596653764 is an equidigital number, since it uses as much as digits as its factorization.

21596653764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022 (or 3511 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 21596653764 in words is "twenty-one billion, five hundred ninety-six million, six hundred fifty-three thousand, seven hundred sixty-four".