21591463152 has 80 divisors (see below), whose sum is σ = 63787345920. Its totient is φ = 6165010176.

The previous prime is 21591463133. The next prime is 21591463169. The reversal of 21591463152 is 25136419512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21591463152.

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, 522049 + ... + 561887.

It is an arithmetic number, because the mean of its divisors is an integer number (797341824).

Almost surely, 2^21591463152 is an apocalyptic number.

It is an amenable number.

21591463152 is an abundant number, since it is smaller than the sum of its proper divisors (42195882768).

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

21591463152 is a wasteful number, since it uses less digits than its factorization.

21591463152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41470 (or 41464 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The spelling of 21591463152 in words is "twenty-one billion, five hundred ninety-one million, four hundred sixty-three thousand, one hundred fifty-two".