172021627 has 4 divisors (see below), whose sum is σ = 173376256. Its totient is φ = 170667000.

The previous prime is 172021613. The next prime is 172021637. The reversal of 172021627 is 726120271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172021627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172021595 and 172021604.

It is not an unprimeable number, because it can be changed into a prime (172021607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677124 + ... + 677377.

It is an arithmetic number, because the mean of its divisors is an integer number (43344064).

Almost surely, 2^172021627 is an apocalyptic number.

172021627 is a deficient number, since it is larger than the sum of its proper divisors (1354629).

172021627 is a wasteful number, since it uses less digits than its factorization.

172021627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354628.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 172021627 is about 13115.7015443323. The cubic root of 172021627 is about 556.1530846262.

Adding to 172021627 its reverse (726120271), we get a palindrome (898141898).

The spelling of 172021627 in words is "one hundred seventy-two million, twenty-one thousand, six hundred twenty-seven".