31222121022 has 12 divisors (see below), whose sum is σ = 67647928920. Its totient is φ = 10407373668.

The previous prime is 31222120997. The next prime is 31222121023. The reversal of 31222121022 is 22012122213.

It is a super-2 number, since 2×31222121022² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1734562279 = 31222121022 / (3 + 1 + 2 + 2 + 2 + 1 + 2 + 1 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 31222120986 and 31222121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222121023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 867281122 + ... + 867281157.

It is an arithmetic number, because the mean of its divisors is an integer number (5637327410).

Almost surely, 2^31222121022 is an apocalyptic number.

31222121022 is an abundant number, since it is smaller than the sum of its proper divisors (36425807898).

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

31222121022 is a wasteful number, since it uses less digits than its factorization.

31222121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734562287 (or 1734562284 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31222121022 its reverse (22012122213), we get a palindrome (53234243235).

The spelling of 31222121022 in words is "thirty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-two".