75232221 has 8 divisors (see below), whose sum is σ = 101031840. Its totient is φ = 49793712.

The previous prime is 75232207. The next prime is 75232249. The reversal of 75232221 is 12223257.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 75232221 - 2⁵ = 75232189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 75232191 and 75232200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75232721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89790 + ... + 90623.

It is an arithmetic number, because the mean of its divisors is an integer number (12628980).

Almost surely, 2^75232221 is an apocalyptic number.

It is an amenable number.

75232221 is a deficient number, since it is larger than the sum of its proper divisors (25799619).

75232221 is a wasteful number, since it uses less digits than its factorization.

75232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180555.

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

The square root of 75232221 is about 8673.6509613888. The cubic root of 75232221 is about 422.1511348182.

Adding to 75232221 its reverse (12223257), we get a palindrome (87455478).

The spelling of 75232221 in words is "seventy-five million, two hundred thirty-two thousand, two hundred twenty-one".