31321101212320 has 96 divisors (see below), whose sum is σ = 74393235680400. Its totient is φ = 12461379993600.

The previous prime is 31321101212281. The next prime is 31321101212333. The reversal of 31321101212320 is 2321210112313.

It can be written as a sum of positive squares in 8 ways, for example, as 26964881043984 + 4356220168336 = 5192772^2 + 2087156^2 .

It is a super-2 number, since 2×31321101212320² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321101212291 and 31321101212300.

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, 21692454 + ... + 23091226.

Almost surely, 2^{31321101212320} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321101212320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37196617840200).

31321101212320 is an abundant number, since it is smaller than the sum of its proper divisors (43072134468080).

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

31321101212320 is a wasteful number, since it uses less digits than its factorization.

31321101212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399538 (or 1399530 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31321101212320 its reverse (2321210112313), we get a palindrome (33642311324633).

The spelling of 31321101212320 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred one million, two hundred twelve thousand, three hundred twenty".