74221 has 8 divisors (see below), whose sum is σ = 88704. Its totient is φ = 60720.

The previous prime is 74219. The next prime is 74231. The reversal of 74221 is 12247.

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

It is not a de Polignac number, because 74221 - 2¹ = 74219 is a prime.

It is an Ulam number.

74221 is a lucky number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 74195 and 74204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74201) 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, 70 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (11088).

2⁷⁴²²¹ is an apocalyptic number.

It is an amenable number.

74221 is a deficient number, since it is larger than the sum of its proper divisors (14483).

74221 is a wasteful number, since it uses less digits than its factorization.

74221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491.

The product of its digits is 112, while the sum is 16.

The square root of 74221 is about 272.4353134232. The cubic root of 74221 is about 42.0251172513.

Adding to 74221 its reverse (12247), we get a palindrome (86468).

The spelling of 74221 in words is "seventy-four thousand, two hundred twenty-one", and thus it is an iban number.