21346397568 has 96 divisors (see below), whose sum is σ = 63086783760. Its totient is φ = 6923142144.

The previous prime is 21346397503. The next prime is 21346397573. The reversal of 21346397568 is 86579364312.

21346397568 is a `hidden beast` number, since 2 + 1 + 3 + 46 + 39 + 7 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21346397568² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207780 + ... + 293027.

Almost surely, 2^21346397568 is an apocalyptic number.

It is an amenable number.

21346397568 is an abundant number, since it is smaller than the sum of its proper divisors (41740386192).

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

21346397568 is a wasteful number, since it uses less digits than its factorization.

21346397568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500864 (or 500849 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 21346397568 in words is "twenty-one billion, three hundred forty-six million, three hundred ninety-seven thousand, five hundred sixty-eight".