23313230021 has 2 divisors, whose sum is σ = 23313230022. Its totient is φ = 23313230020.

The previous prime is 23313229991. The next prime is 23313230023. The reversal of 23313230021 is 12003231332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22571757121 + 741472900 = 150239^2 + 27230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23313230021 is a prime.

Together with 23313230023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23313229975 and 23313230002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23313230023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11656615010 + 11656615011.

It is an arithmetic number, because the mean of its divisors is an integer number (11656615011).

Almost surely, 2^23313230021 is an apocalyptic number.

It is an amenable number.

23313230021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23313230021 is an equidigital number, since it uses as much as digits as its factorization.

23313230021 is an evil number, because the sum of its binary digits is even.

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

Adding to 23313230021 its reverse (12003231332), we get a palindrome (35316461353).

The spelling of 23313230021 in words is "twenty-three billion, three hundred thirteen million, two hundred thirty thousand, twenty-one".