373664021 has 4 divisors (see below), whose sum is σ = 374150700. Its totient is φ = 373177344.

The previous prime is 373663973. The next prime is 373664087. The reversal of 373664021 is 120466373.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120466373 = 1451 ⋅83023.

It can be written as a sum of positive squares in 2 ways, for example, as 299463025 + 74200996 = 17305^2 + 8614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-373664021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (373664321) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 242186 + ... + 243723.

It is an arithmetic number, because the mean of its divisors is an integer number (93537675).

Almost surely, 2^373664021 is an apocalyptic number.

It is an amenable number.

373664021 is a deficient number, since it is larger than the sum of its proper divisors (486679).

373664021 is an equidigital number, since it uses as much as digits as its factorization.

373664021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486678.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 373664021 is about 19330.3911238236. The cubic root of 373664021 is about 720.2674038904.

The spelling of 373664021 in words is "three hundred seventy-three million, six hundred sixty-four thousand, twenty-one".