21957372971031 has 8 divisors (see below), whose sum is σ = 29379947816320. Its totient is φ = 14586523386552.

The previous prime is 21957372970961. The next prime is 21957372971069. The reversal of 21957372971031 is 13017927375912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21957372971031 - 2¹⁰ = 21957372970007 is a prime.

It is a super-2 number, since 2×21957372971031² (a number of 27 digits) contains 22 as substring.

It is the 4685870-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21957372971431) by changing a digit.

It is a nontrivial repunit in base 4685869.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12931314211 + ... + 12931315908.

It is an arithmetic number, because the mean of its divisors is an integer number (3672493477040).

Almost surely, 2^{21957372971031} is an apocalyptic number.

21957372971031 is a deficient number, since it is larger than the sum of its proper divisors (7422574845289).

21957372971031 is a wasteful number, since it uses less digits than its factorization.

21957372971031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25862630405.

The product of its (nonzero) digits is 5000940, while the sum is 57.

The spelling of 21957372971031 in words is "twenty-one trillion, nine hundred fifty-seven billion, three hundred seventy-two million, nine hundred seventy-one thousand, thirty-one".