21064725442000 has 80 divisors (see below), whose sum is σ = 51175902907584. Its totient is φ = 8385956880000.

The previous prime is 21064725441989. The next prime is 21064725442027. The reversal of 21064725442000 is 24452746012.

It is a tau number, because it is divible by the number of its divisors (80).

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, 24536206 + ... + 25380205.

Almost surely, 2^{21064725442000} is an apocalyptic number.

21064725442000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21064725442000 is an abundant number, since it is smaller than the sum of its proper divisors (30111177465584).

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

21064725442000 is a wasteful number, since it uses less digits than its factorization.

21064725442000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49916645 (or 49916629 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 37.

The spelling of 21064725442000 in words is "twenty-one trillion, sixty-four billion, seven hundred twenty-five million, four hundred forty-two thousand".