31213203312122 has 32 divisors (see below), whose sum is σ = 53389994679504. Its totient is φ = 13557989376000.

The previous prime is 31213203312077. The next prime is 31213203312149. The reversal of 31213203312122 is 22121330231213.

It can be written as a sum of positive squares in 8 ways, for example, as 380737127521 + 30832466184601 = 617039^2 + 5552699^2 .

It is a super-2 number, since 2×31213203312122² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 31213203312091 and 31213203312100.

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, 6990122 + ... + 10549322.

Almost surely, 2^{31213203312122} is an apocalyptic number.

31213203312122 is a deficient number, since it is larger than the sum of its proper divisors (22176791367382).

31213203312122 is a wasteful number, since it uses less digits than its factorization.

31213203312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579074.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31213203312122 its reverse (22121330231213), we get a palindrome (53334533543335).

The spelling of 31213203312122 in words is "thirty-one trillion, two hundred thirteen billion, two hundred three million, three hundred twelve thousand, one hundred twenty-two".