23201123021 has 2 divisors, whose sum is σ = 23201123022. Its totient is φ = 23201123020.

The previous prime is 23201122999. The next prime is 23201123039. The reversal of 23201123021 is 12032110232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23155708900 + 45414121 = 152170^2 + 6739^2 .

It is a cyclic number.

It is not a de Polignac number, because 23201123021 - 2³⁰ = 22127381197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23201123821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11600561510 + 11600561511.

It is an arithmetic number, because the mean of its divisors is an integer number (11600561511).

Almost surely, 2^23201123021 is an apocalyptic number.

It is an amenable number.

23201123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23201123021 is an equidigital number, since it uses as much as digits as its factorization.

23201123021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 23201123021 its reverse (12032110232), we get a palindrome (35233233253).

The spelling of 23201123021 in words is "twenty-three billion, two hundred one million, one hundred twenty-three thousand, twenty-one".