74661221 has 4 divisors (see below), whose sum is σ = 74875500. Its totient is φ = 74446944.

The previous prime is 74661217. The next prime is 74661253. The reversal of 74661221 is 12216647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12216647 = 41 ⋅297967.

It can be written as a sum of positive squares in 2 ways, for example, as 56085121 + 18576100 = 7489^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 74661221 - 2² = 74661217 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 (74661271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106616 + ... + 107313.

It is an arithmetic number, because the mean of its divisors is an integer number (18718875).

Almost surely, 2^74661221 is an apocalyptic number.

It is an amenable number.

74661221 is a deficient number, since it is larger than the sum of its proper divisors (214279).

74661221 is a wasteful number, since it uses less digits than its factorization.

74661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214278.

The product of its digits is 4032, while the sum is 29.

The square root of 74661221 is about 8640.6724854030. The cubic root of 74661221 is about 421.0804024553.

Adding to 74661221 its reverse (12216647), we get a palindrome (86877868).

The spelling of 74661221 in words is "seventy-four million, six hundred sixty-one thousand, two hundred twenty-one".