74530221 has 4 divisors (see below), whose sum is σ = 99373632. Its totient is φ = 49686812.

The previous prime is 74530219. The next prime is 74530237. The reversal of 74530221 is 12203547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74530221 - 2¹ = 74530219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74530191 and 74530200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74530121) 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, 12421701 + ... + 12421706.

It is an arithmetic number, because the mean of its divisors is an integer number (24843408).

Almost surely, 2^74530221 is an apocalyptic number.

It is an amenable number.

74530221 is a deficient number, since it is larger than the sum of its proper divisors (24843411).

74530221 is a wasteful number, since it uses less digits than its factorization.

74530221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24843410.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 74530221 is about 8633.0887288386. The cubic root of 74530221 is about 420.8339834734.

Adding to 74530221 its reverse (12203547), we get a palindrome (86733768).

The spelling of 74530221 in words is "seventy-four million, five hundred thirty thousand, two hundred twenty-one".