31222221312 has 40 divisors (see below), whose sum is σ = 83177953056. Its totient is φ = 10407406592.

The previous prime is 31222221293. The next prime is 31222221341. The reversal of 31222221312 is 21312222213.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10161948 + ... + 10165019.

Almost surely, 2^31222221312 is an apocalyptic number.

31222221312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31222221312 is an abundant number, since it is smaller than the sum of its proper divisors (51955731744).

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

31222221312 is an equidigital number, since it uses as much as digits as its factorization.

31222221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20326988 (or 20326972 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 31222221312 its reverse (21312222213), we get a palindrome (52534443525).

Subtracting from 31222221312 its reverse (21312222213), we obtain a palindrome (9909999099).

The spelling of 31222221312 in words is "thirty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, three hundred twelve".