74217221 has 8 divisors (see below), whose sum is σ = 81281760. Its totient is φ = 67346352.

The previous prime is 74217217. The next prime is 74217263. The reversal of 74217221 is 12271247.

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 74217221 - 2² = 74217217 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 (74217271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47615 + ... + 49148.

It is an arithmetic number, because the mean of its divisors is an integer number (10160220).

Almost surely, 2^74217221 is an apocalyptic number.

It is an amenable number.

74217221 is a deficient number, since it is larger than the sum of its proper divisors (7064539).

74217221 is a wasteful number, since it uses less digits than its factorization.

74217221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96835.

The product of its digits is 1568, while the sum is 26.

The square root of 74217221 is about 8614.9417293444. The cubic root of 74217221 is about 420.2440399575.

Adding to 74217221 its reverse (12271247), we get a palindrome (86488468).

The spelling of 74217221 in words is "seventy-four million, two hundred seventeen thousand, two hundred twenty-one".