31131112220010 has 96 divisors (see below), whose sum is σ = 88303686112512. Its totient is φ = 7546548992640.

The previous prime is 31131112220009. The next prime is 31131112220093. The reversal of 31131112220010 is 1002221113113.

31131112220010 is a `hidden beast` number, since 31 + 1 + 311 + 122 + 200 + 1 + 0 = 666.

It is a super-2 number, since 2×31131112220010² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18732712 + ... + 20326748.

It is an arithmetic number, because the mean of its divisors is an integer number (919830063672).

Almost surely, 2^{31131112220010} is an apocalyptic number.

31131112220010 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31131112220010 is an abundant number, since it is smaller than the sum of its proper divisors (57172573892502).

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

31131112220010 is a wasteful number, since it uses less digits than its factorization.

31131112220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613788 (or 1613785 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31131112220010 its reverse (1002221113113), we get a palindrome (32133333333123).

The spelling of 31131112220010 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred twelve million, two hundred twenty thousand, ten".