123131010330221 has 4 divisors (see below), whose sum is σ = 123131858526012. Its totient is φ = 123130162134432.

The previous prime is 123131010330161. The next prime is 123131010330247. The reversal of 123131010330221 is 122033010131321.

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 92989647616996 + 30141362713225 = 9643114^2 + 5490115^2 .

It is a cyclic number.

It is not a de Polignac number, because 123131010330221 - 2⁶ = 123131010330157 is a prime.

It is a super-2 number, since 2×123131010330221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131010330281) 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, 423880106 + ... + 424170491.

It is an arithmetic number, because the mean of its divisors is an integer number (30782964631503).

Almost surely, 2^{123131010330221} is an apocalyptic number.

It is an amenable number.

123131010330221 is a deficient number, since it is larger than the sum of its proper divisors (848195791).

123131010330221 is an equidigital number, since it uses as much as digits as its factorization.

123131010330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848195790.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 123131010330221 its reverse (122033010131321), we get a palindrome (245164020461542).

The spelling of 123131010330221 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, ten million, three hundred thirty thousand, two hundred twenty-one".