75704221 has 2 divisors, whose sum is σ = 75704222. Its totient is φ = 75704220.

The previous prime is 75704219. The next prime is 75704243. The reversal of 75704221 is 12240757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 881721 = 8650^2 + 939^2 .

It is a cyclic number.

It is not a de Polignac number, because 75704221 - 2¹ = 75704219 is a prime.

It is a super-2 number, since 2×75704221² = 11462258154433682, which contains 22 as substring.

Together with 75704219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 75704221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75704521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37852110 + 37852111.

It is an arithmetic number, because the mean of its divisors is an integer number (37852111).

Almost surely, 2^75704221 is an apocalyptic number.

It is an amenable number.

75704221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75704221 is an equidigital number, since it uses as much as digits as its factorization.

75704221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 75704221 is about 8700.8172604647. The cubic root of 75704221 is about 423.0321406611.

Adding to 75704221 its reverse (12240757), we get a palindrome (87944978).

The spelling of 75704221 in words is "seventy-five million, seven hundred four thousand, two hundred twenty-one".