75221 has 8 divisors (see below), whose sum is σ = 82080. Its totient is φ = 68688.

The previous prime is 75217. The next prime is 75223. The reversal of 75221 is 12257.

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

It is a cyclic number.

It is not a de Polignac number, because 75221 - 2² = 75217 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 75221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75223) 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, 650 + ... + 756.

It is an arithmetic number, because the mean of its divisors is an integer number (10260).

2⁷⁵²²¹ is an apocalyptic number.

It is an amenable number.

75221 is a deficient number, since it is larger than the sum of its proper divisors (6859).

75221 is a wasteful number, since it uses less digits than its factorization.

75221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163.

The product of its digits is 140, while the sum is 17.

The square root of 75221 is about 274.2644709035. The cubic root of 75221 is about 42.2130145614.

Adding to 75221 its reverse (12257), we get a palindrome (87478).

The spelling of 75221 in words is "seventy-five thousand, two hundred twenty-one".