321666123 has 8 divisors (see below), whose sum is σ = 440479888. Its totient is φ = 208648224.

The previous prime is 321666097. The next prime is 321666133.

321666123 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-321666123 is a prime.

It is a super-2 number, since 2×321666123² = 206938189371702258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321666133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448836 + ... + 1449057.

It is an arithmetic number, because the mean of its divisors is an integer number (55059986).

Almost surely, 2^321666123 is an apocalyptic number.

321666123 is a deficient number, since it is larger than the sum of its proper divisors (118813765).

321666123 is a wasteful number, since it uses less digits than its factorization.

321666123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897933.

The product of its digits is 7776, while the sum is 30.

The square root of 321666123 is about 17935.0529132200. The cubic root of 321666123 is about 685.1754202906.

The spelling of 321666123 in words is "three hundred twenty-one million, six hundred sixty-six thousand, one hundred twenty-three".