172221612 has 12 divisors (see below), whose sum is σ = 401850456. Its totient is φ = 57407200.

The previous prime is 172221593. The next prime is 172221613. The reversal of 172221612 is 216122271.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (172221613) by changing a digit.

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, 7175889 + ... + 7175912.

It is an arithmetic number, because the mean of its divisors is an integer number (33487538).

Almost surely, 2^172221612 is an apocalyptic number.

172221612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172221612 is an abundant number, since it is smaller than the sum of its proper divisors (229628844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172221612 is a wasteful number, since it uses less digits than its factorization.

172221612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14351808 (or 14351806 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 172221612 is about 13123.3232071758. The cubic root of 172221612 is about 556.3685211067.

Adding to 172221612 its reverse (216122271), we get a palindrome (388343883).

The spelling of 172221612 in words is "one hundred seventy-two million, two hundred twenty-one thousand, six hundred twelve".