123121313021321 has 4 divisors (see below), whose sum is σ = 123124684120272. Its totient is φ = 123117941922372.

The previous prime is 123121313021309. The next prime is 123121313021327. The reversal of 123121313021321 is 123120313121321.

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-123121313021321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123121313021327) 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, 1685494691 + ... + 1685567736.

It is an arithmetic number, because the mean of its divisors is an integer number (30781171030068).

Almost surely, 2^{123121313021321} is an apocalyptic number.

It is an amenable number.

123121313021321 is a deficient number, since it is larger than the sum of its proper divisors (3371098951).

123121313021321 is an equidigital number, since it uses as much as digits as its factorization.

123121313021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371098950.

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

Adding to 123121313021321 its reverse (123120313121321), we get a palindrome (246241626142642).

The spelling of 123121313021321 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, three hundred twenty-one".