123203220120121 has 4 divisors (see below), whose sum is σ = 123205403198692. Its totient is φ = 123201037041552.

The previous prime is 123203220120091. The next prime is 123203220120157. The reversal of 123203220120121 is 121021022302321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118626166366096 + 4577053754025 = 10891564^2 + 2139405^2 .

It is a cyclic number.

It is not a de Polignac number, because 123203220120121 - 2²⁵ = 123203186565689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123203220120092 and 123203220120101.

It is not an unprimeable number, because it can be changed into a prime (123203220120191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091454630 + ... + 1091567503.

It is an arithmetic number, because the mean of its divisors is an integer number (30801350799673).

Almost surely, 2^{123203220120121} is an apocalyptic number.

It is an amenable number.

123203220120121 is a deficient number, since it is larger than the sum of its proper divisors (2183078571).

123203220120121 is an equidigital number, since it uses as much as digits as its factorization.

123203220120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183078570.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 123203220120121 its reverse (121021022302321), we get a palindrome (244224242422442).

The spelling of 123203220120121 in words is "one hundred twenty-three trillion, two hundred three billion, two hundred twenty million, one hundred twenty thousand, one hundred twenty-one".