75220321 has 8 divisors (see below), whose sum is σ = 82198944. Its totient is φ = 68265120.

The previous prime is 75220289. The next prime is 75220349. The reversal of 75220321 is 12302257.

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

It is not a de Polignac number, because 75220321 - 2⁵ = 75220289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75220292 and 75220301.

It is not an unprimeable number, because it can be changed into a prime (75220361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246 + ... + 12328.

It is an arithmetic number, because the mean of its divisors is an integer number (10274868).

Almost surely, 2^75220321 is an apocalyptic number.

It is an amenable number.

75220321 is a deficient number, since it is larger than the sum of its proper divisors (6978623).

75220321 is a wasteful number, since it uses less digits than its factorization.

75220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11711.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 75220321 is about 8672.9649486205. The cubic root of 75220321 is about 422.1288754577.

Adding to 75220321 its reverse (12302257), we get a palindrome (87522578).

The spelling of 75220321 in words is "seventy-five million, two hundred twenty thousand, three hundred twenty-one".