20322320021 has 2 divisors, whose sum is σ = 20322320022. Its totient is φ = 20322320020.

The previous prime is 20322320017. The next prime is 20322320069. The reversal of 20322320021 is 12002322302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18391156996 + 1931163025 = 135614^2 + 43945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20322320021 - 2² = 20322320017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20322320521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161160010 + 10161160011.

It is an arithmetic number, because the mean of its divisors is an integer number (10161160011).

Almost surely, 2^20322320021 is an apocalyptic number.

It is an amenable number.

20322320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20322320021 is an equidigital number, since it uses as much as digits as its factorization.

20322320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20322320021 its reverse (12002322302), we get a palindrome (32324642323).

The spelling of 20322320021 in words is "twenty billion, three hundred twenty-two million, three hundred twenty thousand, twenty-one".