31140233121 has 16 divisors (see below), whose sum is σ = 42654931200. Its totient is φ = 20195748480.

The previous prime is 31140233101. The next prime is 31140233129. The reversal of 31140233121 is 12133204113.

It is not a de Polignac number, because 31140233121 - 2¹⁵ = 31140200353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31140233129) 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, 319785 + ... + 405638.

It is an arithmetic number, because the mean of its divisors is an integer number (2665933200).

Almost surely, 2^31140233121 is an apocalyptic number.

It is an amenable number.

31140233121 is a deficient number, since it is larger than the sum of its proper divisors (11514698079).

31140233121 is a wasteful number, since it uses less digits than its factorization.

31140233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725816.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31140233121 its reverse (12133204113), we get a palindrome (43273437234).

The spelling of 31140233121 in words is "thirty-one billion, one hundred forty million, two hundred thirty-three thousand, one hundred twenty-one".