21023031233 has 4 divisors (see below), whose sum is σ = 21188567040. Its totient is φ = 20857495428.

The previous prime is 21023031193. The next prime is 21023031299. The reversal of 21023031233 is 33213032012.

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 21023031233 - 2¹⁰ = 21023030209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023033233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82767713 + ... + 82767966.

It is an arithmetic number, because the mean of its divisors is an integer number (5297141760).

Almost surely, 2^21023031233 is an apocalyptic number.

It is an amenable number.

21023031233 is a deficient number, since it is larger than the sum of its proper divisors (165535807).

21023031233 is a wasteful number, since it uses less digits than its factorization.

21023031233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165535806.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21023031233 its reverse (33213032012), we get a palindrome (54236063245).

The spelling of 21023031233 in words is "twenty-one billion, twenty-three million, thirty-one thousand, two hundred thirty-three".