12213172 has 6 divisors (see below), whose sum is σ = 21373058. Its totient is φ = 6106584.

The previous prime is 12213169. The next prime is 12213193. The reversal of 12213172 is 27131221.

It can be written as a sum of positive squares in only one way, i.e., 8549776 + 3663396 = 2924^2 + 1914^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1526643 + ... + 1526650.

Almost surely, 2^12213172 is an apocalyptic number.

It is an amenable number.

12213172 is a deficient number, since it is larger than the sum of its proper divisors (9159886).

12213172 is a wasteful number, since it uses less digits than its factorization.

12213172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053297 (or 3053295 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 12213172 is about 3494.7348969557. The cubic root of 12213172 is about 230.2905716287.

Adding to 12213172 its reverse (27131221), we get a palindrome (39344393).

The spelling of 12213172 in words is "twelve million, two hundred thirteen thousand, one hundred seventy-two".