23220320021 has 2 divisors, whose sum is σ = 23220320022. Its totient is φ = 23220320020.

The previous prime is 23220320003. The next prime is 23220320023. The reversal of 23220320021 is 12002302232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13476655921 + 9743664100 = 116089^2 + 98710^2 .

It is a cyclic number.

It is not a de Polignac number, because 23220320021 - 2²² = 23216125717 is a prime.

Together with 23220320023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23220320023) 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 as a sum of consecutive naturals, namely, 11610160010 + 11610160011.

It is an arithmetic number, because the mean of its divisors is an integer number (11610160011).

Almost surely, 2^23220320021 is an apocalyptic number.

It is an amenable number.

23220320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220320021 is an equidigital number, since it uses as much as digits as its factorization.

23220320021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 23220320021 its reverse (12002302232), we get a palindrome (35222622253).

The spelling of 23220320021 in words is "twenty-three billion, two hundred twenty million, three hundred twenty thousand, twenty-one".