646372232021 has 8 divisors (see below), whose sum is σ = 680429782080. Its totient is φ = 612318477888.

The previous prime is 646372231997. The next prime is 646372232047. The reversal of 646372232021 is 120232273646.

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

It is a cyclic number.

It is not a de Polignac number, because 646372232021 - 2³⁰ = 645298490197 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 (646372232081) 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, 596081 + ... + 1283766.

It is an arithmetic number, because the mean of its divisors is an integer number (85053722760).

Almost surely, 2^646372232021 is an apocalyptic number.

It is an amenable number.

646372232021 is a deficient number, since it is larger than the sum of its proper divisors (34057550059).

646372232021 is a wasteful number, since it uses less digits than its factorization.

646372232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897963.

The product of its (nonzero) digits is 145152, while the sum is 38.

The spelling of 646372232021 in words is "six hundred forty-six billion, three hundred seventy-two million, two hundred thirty-two thousand, twenty-one".