31221322112 has 32 divisors (see below), whose sum is σ = 63050783880. Its totient is φ = 15396811776.

The previous prime is 31221322073. The next prime is 31221322157. The reversal of 31221322112 is 21122312213.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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, 1661318 + ... + 1680005.

Almost surely, 2^31221322112 is an apocalyptic number.

31221322112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31221322112 is an abundant number, since it is smaller than the sum of its proper divisors (31829461768).

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

31221322112 is an equidigital number, since it uses as much as digits as its factorization.

31221322112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341410 (or 3341398 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 31221322112 its reverse (21122312213), we get a palindrome (52343634325).

The spelling of 31221322112 in words is "thirty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred twelve".