212172 has 12 divisors (see below), whose sum is σ = 495096. Its totient is φ = 70720.

The previous prime is 212167. The next prime is 212183. The reversal of 212172 is 271212.

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

It is a plaindrome in base 16.

It is a zygodrome in base 2 and base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8829 + ... + 8852.

It is an arithmetic number, because the mean of its divisors is an integer number (41258).

2²¹²¹⁷² is an apocalyptic number.

It is an amenable number.

212172 is an abundant number, since it is smaller than the sum of its proper divisors (282924).

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

212172 is a wasteful number, since it uses less digits than its factorization.

212172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17688 (or 17686 counting only the distinct ones).

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

The square root of 212172 is about 460.6213195240. The cubic root of 212172 is about 59.6434408457.

Adding to 212172 its reverse (271212), we get a palindrome (483384).

The spelling of 212172 in words is "two hundred twelve thousand, one hundred seventy-two", and thus it is an iban number.