31154221121 has 4 divisors (see below), whose sum is σ = 31264306992. Its totient is φ = 31044135252.

The previous prime is 31154221117. The next prime is 31154221141. The reversal of 31154221121 is 12112245113.

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 31154221121 - 2² = 31154221117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31154221141) 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, 55042511 + ... + 55043076.

It is an arithmetic number, because the mean of its divisors is an integer number (7816076748).

Almost surely, 2^31154221121 is an apocalyptic number.

It is an amenable number.

31154221121 is a deficient number, since it is larger than the sum of its proper divisors (110085871).

31154221121 is a wasteful number, since it uses less digits than its factorization.

31154221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110085870.

The product of its digits is 480, while the sum is 23.

Adding to 31154221121 its reverse (12112245113), we get a palindrome (43266466234).

The spelling of 31154221121 in words is "thirty-one billion, one hundred fifty-four million, two hundred twenty-one thousand, one hundred twenty-one".