21725724326140 has 24 divisors (see below), whose sum is σ = 48025285353360. Its totient is φ = 8232906060288.

The previous prime is 21725724326051. The next prime is 21725724326153. The reversal of 21725724326140 is 4162342752712.

It is a congruent number.

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, 28586478997 + ... + 28586479756.

It is an arithmetic number, because the mean of its divisors is an integer number (2001053556390).

Almost surely, 2^{21725724326140} is an apocalyptic number.

21725724326140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21725724326140 is an abundant number, since it is smaller than the sum of its proper divisors (26299561027220).

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

21725724326140 is a wasteful number, since it uses less digits than its factorization.

21725724326140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57172958781 (or 57172958779 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 21725724326140 in words is "twenty-one trillion, seven hundred twenty-five billion, seven hundred twenty-four million, three hundred twenty-six thousand, one hundred forty".