74621221 has 2 divisors, whose sum is σ = 74621222. Its totient is φ = 74621220.

The previous prime is 74621207. The next prime is 74621243. The reversal of 74621221 is 12212647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 6558721 = 8250^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 74621221 - 2⁹ = 74620709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74621251) 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, 37310610 + 37310611.

It is an arithmetic number, because the mean of its divisors is an integer number (37310611).

Almost surely, 2^74621221 is an apocalyptic number.

It is an amenable number.

74621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74621221 is an equidigital number, since it uses as much as digits as its factorization.

74621221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 74621221 is about 8638.3575406439. The cubic root of 74621221 is about 421.0051906086.

Adding to 74621221 its reverse (12212647), we get a palindrome (86833868).

The spelling of 74621221 in words is "seventy-four million, six hundred twenty-one thousand, two hundred twenty-one".