21145306456264 has 32 divisors (see below), whose sum is σ = 40050221500800. Its totient is φ = 10465300843200.

The previous prime is 21145306456259. The next prime is 21145306456273. The reversal of 21145306456264 is 46265460354112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172302 + ... + 6505405.

It is an arithmetic number, because the mean of its divisors is an integer number (1251569421900).

Almost surely, 2^{21145306456264} is an apocalyptic number.

It is an amenable number.

21145306456264 is a deficient number, since it is larger than the sum of its proper divisors (18904915044536).

21145306456264 is a wasteful number, since it uses less digits than its factorization.

21145306456264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681733 (or 6681729 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 21145306456264 in words is "twenty-one trillion, one hundred forty-five billion, three hundred six million, four hundred fifty-six thousand, two hundred sixty-four".