31223131222 has 4 divisors (see below), whose sum is σ = 46834696836. Its totient is φ = 15611565610.

The previous prime is 31223131169. The next prime is 31223131223. The reversal of 31223131222 is 22213132213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22213132213 = 2347 ⋅9464479.

It is a junction number, because it is equal to n+sod(n) for n = 31223131193 and 31223131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223131223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805782804 + ... + 7805782807.

It is an arithmetic number, because the mean of its divisors is an integer number (11708674209).

Almost surely, 2^31223131222 is an apocalyptic number.

31223131222 is a deficient number, since it is larger than the sum of its proper divisors (15611565614).

31223131222 is a wasteful number, since it uses less digits than its factorization.

31223131222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611565613.

The product of its digits is 864, while the sum is 22.

Adding to 31223131222 its reverse (22213132213), we get a palindrome (53436263435).

Subtracting from 31223131222 its reverse (22213132213), we obtain a palindrome (9009999009).

The spelling of 31223131222 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, two hundred twenty-two".