31212101320 has 64 divisors (see below), whose sum is σ = 74380550400. Its totient is φ = 11746913280.

The previous prime is 31212101317. The next prime is 31212101321. The reversal of 31212101320 is 2310121213.

It is a junction number, because it is equal to n+sod(n) for n = 31212101294 and 31212101303.

It is not an unprimeable number, because it can be changed into a prime (31212101321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3844065 + ... + 3852175.

It is an arithmetic number, because the mean of its divisors is an integer number (1162196100).

Almost surely, 2^31212101320 is an apocalyptic number.

It is an amenable number.

31212101320 is an abundant number, since it is smaller than the sum of its proper divisors (43168449080).

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

31212101320 is a wasteful number, since it uses less digits than its factorization.

31212101320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798 (or 13794 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31212101320 its reverse (2310121213), we get a palindrome (33522222533).

The spelling of 31212101320 in words is "thirty-one billion, two hundred twelve million, one hundred one thousand, three hundred twenty".