123231311202121 has 4 divisors (see below), whose sum is σ = 123231596456644. Its totient is φ = 123231025947600.

The previous prime is 123231311202119. The next prime is 123231311202149. The reversal of 123231311202121 is 121202113132321.

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 28746379249225 + 94484931952896 = 5361565^2 + 9720336^2 .

It is a cyclic number.

It is not a de Polignac number, because 123231311202121 - 2¹ = 123231311202119 is a prime.

It is a super-2 number, since 2×123231311202121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123231311202421) 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, 141978270 + ... + 142843591.

It is an arithmetic number, because the mean of its divisors is an integer number (30807899114161).

Almost surely, 2^{123231311202121} is an apocalyptic number.

It is an amenable number.

123231311202121 is a deficient number, since it is larger than the sum of its proper divisors (285254523).

123231311202121 is an equidigital number, since it uses as much as digits as its factorization.

123231311202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285254522.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 123231311202121 its reverse (121202113132321), we get a palindrome (244433424334442).

The spelling of 123231311202121 in words is "one hundred twenty-three trillion, two hundred thirty-one billion, three hundred eleven million, two hundred two thousand, one hundred twenty-one".