221172 has 24 divisors (see below), whose sum is σ = 590016. Its totient is φ = 63168.

The previous prime is 221171. The next prime is 221173. The reversal of 221172 is 271122.

It is an interprime number because it is at equal distance from previous prime (221171) and next prime (221173).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221171) 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 7 ways as a sum of consecutive naturals, for example, 1233 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (24584).

2²²¹¹⁷² is an apocalyptic number.

It is an amenable number.

221172 is an abundant number, since it is smaller than the sum of its proper divisors (368844).

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

221172 is a wasteful number, since it uses less digits than its factorization.

221172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647 (or 2645 counting only the distinct ones).

The product of its digits is 56, while the sum is 15.

The square root of 221172 is about 470.2892726823. The cubic root of 221172 is about 60.4751166937.

Adding to 221172 its reverse (271122), we get a palindrome (492294).

It can be divided in two parts, 221 and 172, that added together give a palindrome (393).

The spelling of 221172 in words is "two hundred twenty-one thousand, one hundred seventy-two", and thus it is an iban number.