74201221 has 2 divisors, whose sum is σ = 74201222. Its totient is φ = 74201220.

The previous prime is 74201207. The next prime is 74201233. The reversal of 74201221 is 12210247.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74200996 + 225 = 8614^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 74201221 - 2¹⁵ = 74168453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74201201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37100610 + 37100611.

It is an arithmetic number, because the mean of its divisors is an integer number (37100611).

Almost surely, 2^74201221 is an apocalyptic number.

It is an amenable number.

74201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74201221 is an equidigital number, since it uses as much as digits as its factorization.

74201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 74201221 is about 8614.0130601248. The cubic root of 74201221 is about 420.2138385757.

Adding to 74201221 its reverse (12210247), we get a palindrome (86411468).

It can be divided in two parts, 74 and 201221, that added together give a triangular number (201295 = T₆₃₄).

The spelling of 74201221 in words is "seventy-four million, two hundred one thousand, two hundred twenty-one".