31312220021132 has 24 divisors (see below), whose sum is σ = 57180091591392. Its totient is φ = 14975080876800.

The previous prime is 31312220021123. The next prime is 31312220021179. The reversal of 31312220021132 is 23112002221313.

It is a super-2 number, since 2×31312220021132² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 31312220021098 and 31312220021107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505082 + ... + 7929662.

It is an arithmetic number, because the mean of its divisors is an integer number (2382503816308).

Almost surely, 2^{31312220021132} is an apocalyptic number.

It is an amenable number.

31312220021132 is a deficient number, since it is larger than the sum of its proper divisors (25867871570260).

31312220021132 is a wasteful number, since it uses less digits than its factorization.

31312220021132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7470449 (or 7470447 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31312220021132 its reverse (23112002221313), we get a palindrome (54424222242445).

The spelling of 31312220021132 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty million, twenty-one thousand, one hundred thirty-two".