21192521560 has 48 divisors (see below), whose sum is σ = 55468186560. Its totient is φ = 7266006720.

The previous prime is 21192521531. The next prime is 21192521621. The reversal of 21192521560 is 6512529112.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5404296 + ... + 5408215.

It is an arithmetic number, because the mean of its divisors is an integer number (1155587220).

Almost surely, 2^21192521560 is an apocalyptic number.

21192521560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21192521560 is an abundant number, since it is smaller than the sum of its proper divisors (34275665000).

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

21192521560 is a wasteful number, since it uses less digits than its factorization.

21192521560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812536 (or 10812525 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 21192521560 in words is "twenty-one billion, one hundred ninety-two million, five hundred twenty-one thousand, five hundred sixty".