21596869512 has 256 divisors, whose sum is σ = 63795859200. Its totient is φ = 6760765440.

The previous prime is 21596869493. The next prime is 21596869523.

21596869512 is a `hidden beast` number, since 2 + 1 + 5 + 9 + 68 + 69 + 512 = 666.

21596869512 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 28379212 + ... + 28379972.

It is an arithmetic number, because the mean of its divisors is an integer number (249202575).

Almost surely, 2^21596869512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21596869512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31897929600).

21596869512 is an abundant number, since it is smaller than the sum of its proper divisors (42198989688).

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

21596869512 is a wasteful number, since it uses less digits than its factorization.

21596869512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933 (or 923 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 21596869512 in words is "twenty-one billion, five hundred ninety-six million, eight hundred sixty-nine thousand, five hundred twelve".