21347595974568 has 128 divisors (see below), whose sum is σ = 56832077635200. Its totient is φ = 6681682344960.

The previous prime is 21347595974563. The next prime is 21347595974609. The reversal of 21347595974568 is 86547959574312.

It is a self number, because there is not a number n which added to its sum of digits gives 21347595974568.

It is not an unprimeable number, because it can be changed into a prime (21347595974563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18027798 + ... + 19175418.

It is an arithmetic number, because the mean of its divisors is an integer number (444000606525).

Almost surely, 2^{21347595974568} 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 21347595974568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28416038817600).

21347595974568 is an abundant number, since it is smaller than the sum of its proper divisors (35484481660632).

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

21347595974568 is a wasteful number, since it uses less digits than its factorization.

21347595974568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147800 (or 1147758 counting only the distinct ones).

The product of its digits is 2286144000, while the sum is 75.

The spelling of 21347595974568 in words is "twenty-one trillion, three hundred forty-seven billion, five hundred ninety-five million, nine hundred seventy-four thousand, five hundred sixty-eight".