23213011021 has 2 divisors, whose sum is σ = 23213011022. Its totient is φ = 23213011020.

The previous prime is 23213010929. The next prime is 23213011067. The reversal of 23213011021 is 12011031232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16970272900 + 6242738121 = 130270^2 + 79011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23213011021 is a prime.

It is a super-2 number, since 2×23213011021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23213010986 and 23213011004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23213011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606505510 + 11606505511.

It is an arithmetic number, because the mean of its divisors is an integer number (11606505511).

Almost surely, 2^23213011021 is an apocalyptic number.

It is an amenable number.

23213011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213011021 is an equidigital number, since it uses as much as digits as its factorization.

23213011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 23213011021 its reverse (12011031232), we get a palindrome (35224042253).

The spelling of 23213011021 in words is "twenty-three billion, two hundred thirteen million, eleven thousand, twenty-one".