75041221 has 2 divisors, whose sum is σ = 75041222. Its totient is φ = 75041220.

The previous prime is 75041209. The next prime is 75041257. The reversal of 75041221 is 12214057.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62188996 + 12852225 = 7886^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 75041221 - 2⁵ = 75041189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 75041192 and 75041201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75041201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37520610 + 37520611.

It is an arithmetic number, because the mean of its divisors is an integer number (37520611).

Almost surely, 2^75041221 is an apocalyptic number.

It is an amenable number.

75041221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75041221 is an equidigital number, since it uses as much as digits as its factorization.

75041221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 75041221 is about 8662.6336064733. The cubic root of 75041221 is about 421.7935788072.

Adding to 75041221 its reverse (12214057), we get a palindrome (87255278).

The spelling of 75041221 in words is "seventy-five million, forty-one thousand, two hundred twenty-one".