31232231121 has 16 divisors (see below), whose sum is σ = 51252892544. Its totient is φ = 16474143744.

The previous prime is 31232231119. The next prime is 31232231131. The reversal of 31232231121 is 12113223213.

It is not a de Polignac number, because 31232231121 - 2¹ = 31232231119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31232231131) 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, 57201616 + ... + 57202161.

It is an arithmetic number, because the mean of its divisors is an integer number (3203305784).

Almost surely, 2^31232231121 is an apocalyptic number.

It is an amenable number.

31232231121 is a deficient number, since it is larger than the sum of its proper divisors (20020661423).

31232231121 is a wasteful number, since it uses less digits than its factorization.

31232231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114403800.

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

Adding to 31232231121 its reverse (12113223213), we get a palindrome (43345454334).

The spelling of 31232231121 in words is "thirty-one billion, two hundred thirty-two million, two hundred thirty-one thousand, one hundred twenty-one".