23131221033 has 32 divisors (see below), whose sum is σ = 31889848320. Its totient is φ = 14905788480.

The previous prime is 23131221031. The next prime is 23131221097. The reversal of 23131221033 is 33012213132.

It is not a de Polignac number, because 23131221033 - 2¹ = 23131221031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23131221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5084866 + ... + 5089412.

It is an arithmetic number, because the mean of its divisors is an integer number (996557760).

Almost surely, 2^23131221033 is an apocalyptic number.

It is an amenable number.

23131221033 is a deficient number, since it is larger than the sum of its proper divisors (8758627287).

23131221033 is a wasteful number, since it uses less digits than its factorization.

23131221033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037.

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

Adding to 23131221033 its reverse (33012213132), we get a palindrome (56143434165).

The spelling of 23131221033 in words is "twenty-three billion, one hundred thirty-one million, two hundred twenty-one thousand, thirty-three".