31112021121 has 16 divisors (see below), whose sum is σ = 41553357888. Its totient is φ = 20706048000.

The previous prime is 31112021093. The next prime is 31112021131. The reversal of 31112021121 is 12112021113.

It is not a de Polignac number, because 31112021121 - 2⁷ = 31112020993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31112021121.

It is not an unprimeable number, because it can be changed into a prime (31112021131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6477921 + ... + 6482721.

It is an arithmetic number, because the mean of its divisors is an integer number (2597084868).

Almost surely, 2^31112021121 is an apocalyptic number.

It is an amenable number.

31112021121 is a deficient number, since it is larger than the sum of its proper divisors (10441336767).

31112021121 is a wasteful number, since it uses less digits than its factorization.

31112021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 31112021121 its reverse (12112021113), we get a palindrome (43224042234).

The spelling of 31112021121 in words is "thirty-one billion, one hundred twelve million, twenty-one thousand, one hundred twenty-one".