172221135 has 32 divisors (see below), whose sum is σ = 292626432. Its totient is φ = 86192640.

The previous prime is 172221131. The next prime is 172221163. The reversal of 172221135 is 531122271.

It is not a de Polignac number, because 172221135 - 2² = 172221131 is a prime.

It is a super-3 number, since 3×172221135³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172221131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109122 + ... + 110688.

It is an arithmetic number, because the mean of its divisors is an integer number (9144576).

Almost surely, 2^172221135 is an apocalyptic number.

172221135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172221135 is a deficient number, since it is larger than the sum of its proper divisors (120405297).

172221135 is a wasteful number, since it uses less digits than its factorization.

172221135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its digits is 840, while the sum is 24.

The square root of 172221135 is about 13123.3050334129. The cubic root of 172221135 is about 556.3680074506.

The spelling of 172221135 in words is "one hundred seventy-two million, two hundred twenty-one thousand, one hundred thirty-five".