31021221112 has 256 divisors, whose sum is σ = 76293734400. Its totient is φ = 11516567040.

The previous prime is 31021221083. The next prime is 31021221139. The reversal of 31021221112 is 21112212013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78138898 + ... + 78139294.

It is an arithmetic number, because the mean of its divisors is an integer number (298022400).

Almost surely, 2^31021221112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31021221112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38146867200).

31021221112 is an abundant number, since it is smaller than the sum of its proper divisors (45272513288).

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

31021221112 is a wasteful number, since it uses less digits than its factorization.

31021221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31021221112 its reverse (21112212013), we get a palindrome (52133433125).

Subtracting from 31021221112 its reverse (21112212013), we obtain a palindrome (9909009099).

The spelling of 31021221112 in words is "thirty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred twelve".