31131122222022 has 64 divisors (see below), whose sum is σ = 62678447688960. Its totient is φ = 10307908222976.

The previous prime is 31131122221963. The next prime is 31131122222023. The reversal of 31131122222022 is 22022222113113.

It is a junction number, because it is equal to n+sod(n) for n = 31131122221983 and 31131122222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131122222023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1100453254 + ... + 1100481542.

It is an arithmetic number, because the mean of its divisors is an integer number (979350745140).

Almost surely, 2^{31131122222022} is an apocalyptic number.

31131122222022 is an abundant number, since it is smaller than the sum of its proper divisors (31547325466938).

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

31131122222022 is a wasteful number, since it uses less digits than its factorization.

31131122222022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30325.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31131122222022 its reverse (22022222113113), we get a palindrome (53153344335135).

The spelling of 31131122222022 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, twenty-two".