321663442 has 4 divisors (see below), whose sum is σ = 482495166. Its totient is φ = 160831720.

The previous prime is 321663439. The next prime is 321663493. The reversal of 321663442 is 244366123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244366123 = 9511 ⋅25693.

It can be written as a sum of positive squares in only one way, i.e., 284563161 + 37100281 = 16869^2 + 6091^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80415859 + ... + 80415862.

Almost surely, 2^321663442 is an apocalyptic number.

321663442 is a deficient number, since it is larger than the sum of its proper divisors (160831724).

321663442 is a wasteful number, since it uses less digits than its factorization.

321663442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160831723.

The product of its digits is 20736, while the sum is 31.

The square root of 321663442 is about 17934.9781711604. The cubic root of 321663442 is about 685.1735167015.

The spelling of 321663442 in words is "three hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-two".