23210821121 has 2 divisors, whose sum is σ = 23210821122. Its totient is φ = 23210821120.

The previous prime is 23210821111. The next prime is 23210821129. The reversal of 23210821121 is 12112801232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22189379521 + 1021441600 = 148961^2 + 31960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23210821121 - 2¹⁸ = 23210558977 is a prime.

It is a super-2 number, since 2×23210821121² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23210821129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605410560 + 11605410561.

It is an arithmetic number, because the mean of its divisors is an integer number (11605410561).

Almost surely, 2^23210821121 is an apocalyptic number.

It is an amenable number.

23210821121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23210821121 is an equidigital number, since it uses as much as digits as its factorization.

23210821121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 23210821121 in words is "twenty-three billion, two hundred ten million, eight hundred twenty-one thousand, one hundred twenty-one".