75393428221 has 4 divisors (see below), whose sum is σ = 75397921312. Its totient is φ = 75388935132.

The previous prime is 75393428213. The next prime is 75393428233. The reversal of 75393428221 is 12282439357.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12282439357 = 359 ⋅34212923.

It is a cyclic number.

It is not a de Polignac number, because 75393428221 - 2³ = 75393428213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75393428291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221281 + ... + 2254966.

It is an arithmetic number, because the mean of its divisors is an integer number (18849480328).

Almost surely, 2^75393428221 is an apocalyptic number.

It is an amenable number.

75393428221 is a deficient number, since it is larger than the sum of its proper divisors (4493091).

75393428221 is a wasteful number, since it uses less digits than its factorization.

75393428221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493090.

The product of its digits is 725760, while the sum is 46.

The spelling of 75393428221 in words is "seventy-five billion, three hundred ninety-three million, four hundred twenty-eight thousand, two hundred twenty-one".