172221268 has 12 divisors (see below), whose sum is σ = 302716512. Its totient is φ = 85730840.

The previous prime is 172221241. The next prime is 172221281. The reversal of 172221268 is 862122271.

It is a happy number.

It is a super-3 number, since 3×172221268³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93928 + ... + 95743.

It is an arithmetic number, because the mean of its divisors is an integer number (25226376).

Almost surely, 2^172221268 is an apocalyptic number.

It is an amenable number.

172221268 is a deficient number, since it is larger than the sum of its proper divisors (130495244).

172221268 is a wasteful number, since it uses less digits than its factorization.

172221268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189902 (or 189900 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 172221268 is about 13123.3101007330. The cubic root of 172221268 is about 556.3681506714.

The spelling of 172221268 in words is "one hundred seventy-two million, two hundred twenty-one thousand, two hundred sixty-eight".