123203132100221 has 2 divisors, whose sum is σ = 123203132100222. Its totient is φ = 123203132100220.

The previous prime is 123203132100149. The next prime is 123203132100287. The reversal of 123203132100221 is 122001231302321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121525511347321 + 1677620752900 = 11023861^2 + 1295230^2 .

It is a cyclic number.

It is not a de Polignac number, because 123203132100221 - 2¹⁰ = 123203132099197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123203132100421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61601566050110 + 61601566050111.

It is an arithmetic number, because the mean of its divisors is an integer number (61601566050111).

Almost surely, 2^{123203132100221} is an apocalyptic number.

It is an amenable number.

123203132100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203132100221 is an equidigital number, since it uses as much as digits as its factorization.

123203132100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 123203132100221 its reverse (122001231302321), we get a palindrome (245204363402542).

The spelling of 123203132100221 in words is "one hundred twenty-three trillion, two hundred three billion, one hundred thirty-two million, one hundred thousand, two hundred twenty-one".