172227621 has 8 divisors (see below), whose sum is σ = 231445504. Its totient is φ = 113914080.

The previous prime is 172227589. The next prime is 172227623. The reversal of 172227621 is 126722271.

172227621 is nontrivially palindromic in base 2.

172227621 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 not a de Polignac number, because 172227621 - 2⁵ = 172227589 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 (172227623) 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, 225640 + ... + 226401.

It is an arithmetic number, because the mean of its divisors is an integer number (28930688).

Almost surely, 2^172227621 is an apocalyptic number.

It is an amenable number.

172227621 is a deficient number, since it is larger than the sum of its proper divisors (59217883).

172227621 is a wasteful number, since it uses less digits than its factorization.

172227621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452171.

The product of its digits is 4704, while the sum is 30.

The square root of 172227621 is about 13123.5521487134. The cubic root of 172227621 is about 556.3749917998.

Adding to 172227621 its reverse (126722271), we get a palindrome (298949892).

The spelling of 172227621 in words is "one hundred seventy-two million, two hundred twenty-seven thousand, six hundred twenty-one".