2172243621 has 8 divisors (see below), whose sum is σ = 2896545024. Its totient is φ = 1448052320.

The previous prime is 2172243587. The next prime is 2172243677. The reversal of 2172243621 is 1263422712.

2172243621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2172243621 - 2¹¹ = 2172241573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172243691) 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, 48556 + ... + 81866.

It is an arithmetic number, because the mean of its divisors is an integer number (362068128).

Almost surely, 2^2172243621 is an apocalyptic number.

It is an amenable number.

2172243621 is a deficient number, since it is larger than the sum of its proper divisors (724301403).

2172243621 is a wasteful number, since it uses less digits than its factorization.

2172243621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55051.

The product of its digits is 8064, while the sum is 30.

The square root of 2172243621 is about 46607.3344120858. The cubic root of 2172243621 is about 1295.0986286643.

The spelling of 2172243621 in words is "two billion, one hundred seventy-two million, two hundred forty-three thousand, six hundred twenty-one".