31521423432512 has 56 divisors (see below), whose sum is σ = 68028837624552. Its totient is φ = 14404306176000.

The previous prime is 31521423432481. The next prime is 31521423432523. The reversal of 31521423432512 is 21523432412513.

It can be written as a sum of positive squares in 4 ways, for example, as 993323182336 + 30528100250176 = 996656^2 + 5525224^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187472039 + ... + 187640102.

It is an arithmetic number, because the mean of its divisors is an integer number (1214800671867).

Almost surely, 2^{31521423432512} is an apocalyptic number.

31521423432512 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31521423432512 is an abundant number, since it is smaller than the sum of its proper divisors (36507414192040).

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

31521423432512 is a wasteful number, since it uses less digits than its factorization.

31521423432512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375112267 (or 375112257 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The spelling of 31521423432512 in words is "thirty-one trillion, five hundred twenty-one billion, four hundred twenty-three million, four hundred thirty-two thousand, five hundred twelve".