31313121221022 has 16 divisors (see below), whose sum is σ = 62954128530432. Its totient is φ = 10383059392280.

The previous prime is 31313121220987. The next prime is 31313121221033. The reversal of 31313121221022 is 22012212131313.

It is a junction number, because it is equal to n+sod(n) for n = 31313121220983 and 31313121221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13661919108 + ... + 13661921399.

It is an arithmetic number, because the mean of its divisors is an integer number (3934633033152).

Almost surely, 2^{31313121221022} is an apocalyptic number.

31313121221022 is an abundant number, since it is smaller than the sum of its proper divisors (31641007309410).

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

31313121221022 is a wasteful number, since it uses less digits than its factorization.

31313121221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27323840703.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31313121221022 its reverse (22012212131313), we get a palindrome (53325333352335).

The spelling of 31313121221022 in words is "thirty-one trillion, three hundred thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-two".