321656656123 has 4 divisors (see below), whose sum is σ = 350898170328. Its totient is φ = 292415141920.

The previous prime is 321656656081. The next prime is 321656656133.

321656656123 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 321656656123 - 2⁹ = 321656655611 is a prime.

It is a super-2 number, since 2×321656656123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321656656133) 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, 14620757086 + ... + 14620757107.

It is an arithmetic number, because the mean of its divisors is an integer number (87724542582).

Almost surely, 2^321656656123 is an apocalyptic number.

321656656123 is a deficient number, since it is larger than the sum of its proper divisors (29241514205).

321656656123 is a wasteful number, since it uses less digits than its factorization.

321656656123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29241514204.

The product of its digits is 1166400, while the sum is 46.

It can be divided in two parts, 321656 and 656123, that added together give a palindrome (977779).

The spelling of 321656656123 in words is "three hundred twenty-one billion, six hundred fifty-six million, six hundred fifty-six thousand, one hundred twenty-three".