21359107968 has 64 divisors (see below), whose sum is σ = 61892881920. Its totient is φ = 6472455680.

The previous prime is 21359107949. The next prime is 21359107969. The reversal of 21359107968 is 86970195312.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21359107968² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21359107968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359107969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2524080 + ... + 2532527.

It is an arithmetic number, because the mean of its divisors is an integer number (967076280).

Almost surely, 2^21359107968 is an apocalyptic number.

It is an amenable number.

21359107968 is an abundant number, since it is smaller than the sum of its proper divisors (40533773952).

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

21359107968 is a wasteful number, since it uses less digits than its factorization.

21359107968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056635 (or 5056623 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 21359107968 in words is "twenty-one billion, three hundred fifty-nine million, one hundred seven thousand, nine hundred sixty-eight".