74144221 has 2 divisors, whose sum is σ = 74144222. Its totient is φ = 74144220.

The previous prime is 74144197. The next prime is 74144227. The reversal of 74144221 is 12244147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73359225 + 784996 = 8565^2 + 886^2 .

It is an emirp because it is prime and its reverse (12244147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74144221 - 2¹⁹ = 73619933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74144227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37072110 + 37072111.

It is an arithmetic number, because the mean of its divisors is an integer number (37072111).

Almost surely, 2^74144221 is an apocalyptic number.

It is an amenable number.

74144221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74144221 is an equidigital number, since it uses as much as digits as its factorization.

74144221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 25.

The square root of 74144221 is about 8610.7038620545. The cubic root of 74144221 is about 420.1062108561.

Adding to 74144221 its reverse (12244147), we get a palindrome (86388368).

The spelling of 74144221 in words is "seventy-four million, one hundred forty-four thousand, two hundred twenty-one".