31000022112 has 96 divisors (see below), whose sum is σ = 82273260384. Its totient is φ = 10219520000.

The previous prime is 31000022107. The next prime is 31000022143. The reversal of 31000022112 is 21122000013.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×31000022112² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15522298 + ... + 15524294.

It is an arithmetic number, because the mean of its divisors is an integer number (857013129).

Almost surely, 2^31000022112 is an apocalyptic number.

31000022112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41136630192).

31000022112 is an abundant number, since it is smaller than the sum of its proper divisors (51273238272).

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

31000022112 is a wasteful number, since it uses less digits than its factorization.

31000022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712 (or 3704 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31000022112 its reverse (21122000013), we get a palindrome (52122022125).

The spelling of 31000022112 in words is "thirty-one billion, twenty-two thousand, one hundred twelve".