123121231011213 has 4 divisors (see below), whose sum is σ = 164161641348288. Its totient is φ = 82080820674140.

The previous prime is 123121231011199. The next prime is 123121231011223. The reversal of 123121231011213 is 312110132121321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123121231011213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121231011223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20520205168533 + ... + 20520205168538.

It is an arithmetic number, because the mean of its divisors is an integer number (41040410337072).

Almost surely, 2^{123121231011213} is an apocalyptic number.

It is an amenable number.

123121231011213 is a deficient number, since it is larger than the sum of its proper divisors (41040410337075).

123121231011213 is an equidigital number, since it uses as much as digits as its factorization.

123121231011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41040410337074.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 123121231011213 its reverse (312110132121321), we get a palindrome (435231363132534).

The spelling of 123121231011213 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, two hundred thirty-one million, eleven thousand, two hundred thirteen".