75433221 has 8 divisors (see below), whose sum is σ = 111752960. Its totient is φ = 50288796.

The previous prime is 75433219. The next prime is 75433231. The reversal of 75433221 is 12233457.

75433221 is a `hidden beast` number, since 7 + 5 + 433 + 221 = 666.

It is not a de Polignac number, because 75433221 - 2¹ = 75433219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2793823 = 75433221 / (7 + 5 + 4 + 3 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75433201) 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, 1396885 + ... + 1396938.

It is an arithmetic number, because the mean of its divisors is an integer number (13969120).

Almost surely, 2^75433221 is an apocalyptic number.

It is an amenable number.

75433221 is a deficient number, since it is larger than the sum of its proper divisors (36319739).

75433221 is a wasteful number, since it uses less digits than its factorization.

75433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793832 (or 2793826 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 75433221 is about 8685.2300487667. The cubic root of 75433221 is about 422.5267581060.

Adding to 75433221 its reverse (12233457), we get a palindrome (87666678).

The spelling of 75433221 in words is "seventy-five million, four hundred thirty-three thousand, two hundred twenty-one".