31021220112 has 40 divisors (see below), whose sum is σ = 81451899840. Its totient is φ = 10170890880.

The previous prime is 31021220071. The next prime is 31021220179. The reversal of 31021220112 is 21102212013.

It is a junction number, because it is equal to n+sod(n) for n = 31021220091 and 31021220100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5294412 + ... + 5300267.

It is an arithmetic number, because the mean of its divisors is an integer number (2036297496).

Almost surely, 2^31021220112 is an apocalyptic number.

It is an amenable number.

31021220112 is an abundant number, since it is smaller than the sum of its proper divisors (50430679728).

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

31021220112 is a wasteful number, since it uses less digits than its factorization.

31021220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594751 (or 10594745 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31021220112 its reverse (21102212013), we get a palindrome (52123432125).

The spelling of 31021220112 in words is "thirty-one billion, twenty-one million, two hundred twenty thousand, one hundred twelve".