31721232381696 has 216 divisors, whose sum is σ = 107449667999856. Its totient is φ = 8873071902720.

The previous prime is 31721232381673. The next prime is 31721232381721. The reversal of 31721232381696 is 69618323212713.

31721232381696 is a `hidden beast` number, since 3 + 1 + 7 + 21 + 232 + 381 + 6 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47810025 + ... + 48468968.

It is an arithmetic number, because the mean of its divisors is an integer number (497452166666).

Almost surely, 2^{31721232381696} is an apocalyptic number.

31721232381696 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31721232381696 is an abundant number, since it is smaller than the sum of its proper divisors (75728435618160).

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

31721232381696 is a wasteful number, since it uses less digits than its factorization.

31721232381696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96279039 (or 96279022 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 31721232381696 in words is "thirty-one trillion, seven hundred twenty-one billion, two hundred thirty-two million, three hundred eighty-one thousand, six hundred ninety-six".