20323213021 has 4 divisors (see below), whose sum is σ = 21024013500. Its totient is φ = 19622412544.

The previous prime is 20323212977. The next prime is 20323213039. The reversal of 20323213021 is 12031232302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13699532025 + 6623680996 = 117045^2 + 81386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323213021 - 2⁹ = 20323212509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20323213021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323213051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350400196 + ... + 350400253.

It is an arithmetic number, because the mean of its divisors is an integer number (5256003375).

Almost surely, 2^20323213021 is an apocalyptic number.

It is an amenable number.

20323213021 is a deficient number, since it is larger than the sum of its proper divisors (700800479).

20323213021 is an equidigital number, since it uses as much as digits as its factorization.

20323213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700800478.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20323213021 its reverse (12031232302), we get a palindrome (32354445323).

The spelling of 20323213021 in words is "twenty billion, three hundred twenty-three million, two hundred thirteen thousand, twenty-one".