321646157123 has 4 divisors (see below), whose sum is σ = 321647400840. Its totient is φ = 321644913408.

The previous prime is 321646157087. The next prime is 321646157201. The reversal of 321646157123 is 321751646123.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 321751646123 = 17 ⋅18926567419.

It is a cyclic number.

It is not a de Polignac number, because 321646157123 - 2⁶ = 321646157059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321646187123) 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, 71678 + ... + 805251.

It is an arithmetic number, because the mean of its divisors is an integer number (80411850210).

Almost surely, 2^321646157123 is an apocalyptic number.

321646157123 is a deficient number, since it is larger than the sum of its proper divisors (1243717).

321646157123 is an equidigital number, since it uses as much as digits as its factorization.

321646157123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243716.

The product of its digits is 181440, while the sum is 41.

The spelling of 321646157123 in words is "three hundred twenty-one billion, six hundred forty-six million, one hundred fifty-seven thousand, one hundred twenty-three".