31121232033 has 4 divisors (see below), whose sum is σ = 41494976048. Its totient is φ = 20747488020.

The previous prime is 31121232013. The next prime is 31121232047. The reversal of 31121232033 is 33023212113.

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 not a de Polignac number, because 31121232033 - 2⁶ = 31121231969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121232013) 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, 5186872003 + ... + 5186872008.

It is an arithmetic number, because the mean of its divisors is an integer number (10373744012).

Almost surely, 2^31121232033 is an apocalyptic number.

It is an amenable number.

31121232033 is a deficient number, since it is larger than the sum of its proper divisors (10373744015).

31121232033 is a wasteful number, since it uses less digits than its factorization.

31121232033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10373744014.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31121232033 its reverse (33023212113), we get a palindrome (64144444146).

The spelling of 31121232033 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, thirty-three".