123312012112213 has 4 divisors (see below), whose sum is σ = 127564150460940. Its totient is φ = 119059873763488.

The previous prime is 123312012112171. The next prime is 123312012112283. The reversal of 123312012112213 is 312211210213321.

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 76147299442564 + 47164712669649 = 8726242^2 + 6867657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123312012112213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312012112283) 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, 2126069174320 + ... + 2126069174377.

It is an arithmetic number, because the mean of its divisors is an integer number (31891037615235).

Almost surely, 2^{123312012112213} is an apocalyptic number.

It is an amenable number.

123312012112213 is a deficient number, since it is larger than the sum of its proper divisors (4252138348727).

123312012112213 is an equidigital number, since it uses as much as digits as its factorization.

123312012112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252138348726.

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

Adding to 123312012112213 its reverse (312211210213321), we get a palindrome (435523222325534).

The spelling of 123312012112213 in words is "one hundred twenty-three trillion, three hundred twelve billion, twelve million, one hundred twelve thousand, two hundred thirteen".