31204231121 has 4 divisors (see below), whose sum is σ = 35661978432. Its totient is φ = 26746483812.

The previous prime is 31204231109. The next prime is 31204231147. The reversal of 31204231121 is 12113240213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31204231121 - 2⁶ = 31204231057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31204231093 and 31204231102.

It is not an unprimeable number, because it can be changed into a prime (31204231621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228873645 + ... + 2228873658.

It is an arithmetic number, because the mean of its divisors is an integer number (8915494608).

Almost surely, 2^31204231121 is an apocalyptic number.

It is an amenable number.

31204231121 is a deficient number, since it is larger than the sum of its proper divisors (4457747311).

31204231121 is an equidigital number, since it uses as much as digits as its factorization.

31204231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457747310.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31204231121 its reverse (12113240213), we get a palindrome (43317471334).

The spelling of 31204231121 in words is "thirty-one billion, two hundred four million, two hundred thirty-one thousand, one hundred twenty-one".