221214172 has 12 divisors (see below), whose sum is σ = 387537696. Its totient is φ = 110489120.

The previous prime is 221214167. The next prime is 221214179. The reversal of 221214172 is 271412122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221214179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25204 + ... + 32827.

It is an arithmetic number, because the mean of its divisors is an integer number (32294808).

Almost surely, 2^221214172 is an apocalyptic number.

It is an amenable number.

221214172 is a deficient number, since it is larger than the sum of its proper divisors (166323524).

221214172 is a wasteful number, since it uses less digits than its factorization.

221214172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58988 (or 58986 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 221214172 is about 14873.2703868383. The cubic root of 221214172 is about 604.7896014969.

Adding to 221214172 its reverse (271412122), we get a palindrome (492626294).

It can be divided in two parts, 2212 and 14172, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 221214172 in words is "two hundred twenty-one million, two hundred fourteen thousand, one hundred seventy-two".