12212171 has 8 divisors (see below), whose sum is σ = 13348224. Its totient is φ = 11122560.

The previous prime is 12212159. The next prime is 12212173. The reversal of 12212171 is 17121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12212171 - 2⁶ = 12212107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11060 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (1668528).

Almost surely, 2^12212171 is an apocalyptic number.

12212171 is a deficient number, since it is larger than the sum of its proper divisors (1136053).

12212171 is a wasteful number, since it uses less digits than its factorization.

12212171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23221.

The product of its digits is 56, while the sum is 17.

The square root of 12212171 is about 3494.5916785799. The cubic root of 12212171 is about 230.2842798655.

Adding to 12212171 its reverse (17121221), we get a palindrome (29333392).

The spelling of 12212171 in words is "twelve million, two hundred twelve thousand, one hundred seventy-one".