21273740128392 has 64 divisors (see below), whose sum is σ = 54625335585600. Its totient is φ = 6899140396800.

The previous prime is 21273740128373. The next prime is 21273740128451. The reversal of 21273740128392 is 29382104737212.

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, 12945234 + ... + 14495742.

It is an arithmetic number, because the mean of its divisors is an integer number (853520868525).

Almost surely, 2^{21273740128392} is an apocalyptic number.

It is an amenable number.

21273740128392 is an abundant number, since it is smaller than the sum of its proper divisors (33351595457208).

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

21273740128392 is a wasteful number, since it uses less digits than its factorization.

21273740128392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566006 (or 1566002 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 21273740128392 in words is "twenty-one trillion, two hundred seventy-three billion, seven hundred forty million, one hundred twenty-eight thousand, three hundred ninety-two".