21264846456 has 64 divisors (see below), whose sum is σ = 61663553280. Its totient is φ = 5984985600.

The previous prime is 21264846439. The next prime is 21264846461. The reversal of 21264846456 is 65464846212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933345 + ... + 955856.

It is an arithmetic number, because the mean of its divisors is an integer number (963493020).

Almost surely, 2^21264846456 is an apocalyptic number.

It is an amenable number.

21264846456 is an abundant number, since it is smaller than the sum of its proper divisors (40398706824).

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

21264846456 is a wasteful number, since it uses less digits than its factorization.

21264846456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889284 (or 1889280 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 48.

The spelling of 21264846456 in words is "twenty-one billion, two hundred sixty-four million, eight hundred forty-six thousand, four hundred fifty-six".