21569296512 has 32 divisors (see below), whose sum is σ = 57293444880. Its totient is φ = 7189765376.

The previous prime is 21569296493. The next prime is 21569296513.

21569296512 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21569296512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21569296513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28084638 + ... + 28085405.

Almost surely, 2^21569296512 is an apocalyptic number.

It is an amenable number.

21569296512 is an abundant number, since it is smaller than the sum of its proper divisors (35724148368).

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

21569296512 is an equidigital number, since it uses as much as digits as its factorization.

21569296512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56170060 (or 56170048 counting only the distinct ones).

The product of its digits is 583200, while the sum is 48.

The spelling of 21569296512 in words is "twenty-one billion, five hundred sixty-nine million, two hundred ninety-six thousand, five hundred twelve".