31021231120 has 80 divisors (see below), whose sum is σ = 78710730048. Its totient is φ = 11276203520.

The previous prime is 31021231099. The next prime is 31021231127. The reversal of 31021231120 is 2113212013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 31021231094 and 31021231103.

It is not an unprimeable number, because it can be changed into a prime (31021231127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230967 + ... + 3240553.

Almost surely, 2^31021231120 is an apocalyptic number.

It is an amenable number.

31021231120 is an abundant number, since it is smaller than the sum of its proper divisors (47689498928).

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

31021231120 is a wasteful number, since it uses less digits than its factorization.

31021231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13288 (or 13282 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31021231120 its reverse (2113212013), we get a palindrome (33134443133).

The spelling of 31021231120 in words is "thirty-one billion, twenty-one million, two hundred thirty-one thousand, one hundred twenty".