21464520256704 has 56 divisors (see below), whose sum is σ = 64904620780288. Its totient is φ = 6132720072960.

The previous prime is 21464520256691. The next prime is 21464520256741. The reversal of 21464520256704 is 40765202546412.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 7985311252 + ... + 7985313939.

Almost surely, 2^{21464520256704} is an apocalyptic number.

21464520256704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21464520256704 is an abundant number, since it is smaller than the sum of its proper divisors (43440100523584).

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

21464520256704 is a wasteful number, since it uses less digits than its factorization.

21464520256704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970625213 (or 15970625203 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 48.

The spelling of 21464520256704 in words is "twenty-one trillion, four hundred sixty-four billion, five hundred twenty million, two hundred fifty-six thousand, seven hundred four".