20312333021 has 4 divisors (see below), whose sum is σ = 21381403200. Its totient is φ = 19243262844.

The previous prime is 20312333009. The next prime is 20312333039. The reversal of 20312333021 is 12033321302.

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 a de Polignac number, because none of the positive numbers 2^k-20312333021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312332984 and 20312333002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312330021) 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, 534535061 + ... + 534535098.

It is an arithmetic number, because the mean of its divisors is an integer number (5345350800).

Almost surely, 2^20312333021 is an apocalyptic number.

It is an amenable number.

20312333021 is a deficient number, since it is larger than the sum of its proper divisors (1069070179).

20312333021 is a wasteful number, since it uses less digits than its factorization.

20312333021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069070178.

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

Adding to 20312333021 its reverse (12033321302), we get a palindrome (32345654323).

The spelling of 20312333021 in words is "twenty billion, three hundred twelve million, three hundred thirty-three thousand, twenty-one".