2173646321 has 24 divisors (see below), whose sum is σ = 2796230304. Its totient is φ = 1670518080.

The previous prime is 2173646311. The next prime is 2173646329. The reversal of 2173646321 is 1236463712.

2173646321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-2173646321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2173646329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11726 + ... + 66968.

It is an arithmetic number, because the mean of its divisors is an integer number (116509596).

Almost surely, 2^2173646321 is an apocalyptic number.

It is an amenable number.

2173646321 is a deficient number, since it is larger than the sum of its proper divisors (622583983).

2173646321 is a wasteful number, since it uses less digits than its factorization.

2173646321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55341 (or 55334 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 2173646321 is about 46622.3800443521. The cubic root of 2173646321 is about 1295.3773334323.

The spelling of 2173646321 in words is "two billion, one hundred seventy-three million, six hundred forty-six thousand, three hundred twenty-one".