23021200021 has 2 divisors, whose sum is σ = 23021200022. Its totient is φ = 23021200020.

The previous prime is 23021199989. The next prime is 23021200039. The reversal of 23021200021 is 12000212032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14104175121 + 8917024900 = 118761^2 + 94430^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021200021 - 2⁵ = 23021199989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23021199974 and 23021200010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23021200051) 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, 11510600010 + 11510600011.

It is an arithmetic number, because the mean of its divisors is an integer number (11510600011).

Almost surely, 2^23021200021 is an apocalyptic number.

It is an amenable number.

23021200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021200021 is an equidigital number, since it uses as much as digits as its factorization.

23021200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 23021200021 its reverse (12000212032), we get a palindrome (35021412053).

The spelling of 23021200021 in words is "twenty-three billion, twenty-one million, two hundred thousand, twenty-one".