123130321213121 has 4 divisors (see below), whose sum is σ = 123130362658644. Its totient is φ = 123130279767600.

The previous prime is 123130321213043. The next prime is 123130321213187. The reversal of 123130321213121 is 121312123031321.

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 121289781290896 + 1840539922225 = 11013164^2 + 1356665^2 .

It is a cyclic number.

It is not a de Polignac number, because 123130321213121 - 2²² = 123130317018817 is a prime.

It is a super-2 number, since 2×123130321213121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123130321213721) 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, 15890870 + ... + 22333391.

It is an arithmetic number, because the mean of its divisors is an integer number (30782590664661).

Almost surely, 2^{123130321213121} is an apocalyptic number.

It is an amenable number.

123130321213121 is a deficient number, since it is larger than the sum of its proper divisors (41445523).

123130321213121 is an equidigital number, since it uses as much as digits as its factorization.

123130321213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41445522.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 123130321213121 its reverse (121312123031321), we get a palindrome (244442444244442).

The spelling of 123130321213121 in words is "one hundred twenty-three trillion, one hundred thirty billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred twenty-one".