221214173 has 4 divisors (see below), whose sum is σ = 223879488. Its totient is φ = 218548860.

The previous prime is 221214167. The next prime is 221214179. The reversal of 221214173 is 371412122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 371412122 = 2 ⋅185706061.

It is an interprime number because it is at equal distance from previous prime (221214167) and next prime (221214179).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221214173 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332533 + ... + 1332698.

It is an arithmetic number, because the mean of its divisors is an integer number (55969872).

Almost surely, 2^221214173 is an apocalyptic number.

It is an amenable number.

221214173 is a deficient number, since it is larger than the sum of its proper divisors (2665315).

221214173 is an equidigital number, since it uses as much as digits as its factorization.

221214173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665314.

The product of its digits is 672, while the sum is 23.

The square root of 221214173 is about 14873.2704204556. The cubic root of 221214173 is about 604.7896024083.

Adding to 221214173 its reverse (371412122), we get a palindrome (592626295).

The spelling of 221214173 in words is "two hundred twenty-one million, two hundred fourteen thousand, one hundred seventy-three".