75047221 has 4 divisors (see below), whose sum is σ = 75638272. Its totient is φ = 74456172.

The previous prime is 75047209. The next prime is 75047237. The reversal of 75047221 is 12274057.

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: 12274057 = 19 ⋅646003.

It is a cyclic number.

It is not a de Polignac number, because 75047221 - 2¹⁵ = 75014453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75047221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75047201) 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, 295335 + ... + 295588.

It is an arithmetic number, because the mean of its divisors is an integer number (18909568).

Almost surely, 2^75047221 is an apocalyptic number.

It is an amenable number.

75047221 is a deficient number, since it is larger than the sum of its proper divisors (591051).

75047221 is a wasteful number, since it uses less digits than its factorization.

75047221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591050.

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

The square root of 75047221 is about 8662.9799145560. The cubic root of 75047221 is about 421.8048201578.

The spelling of 75047221 in words is "seventy-five million, forty-seven thousand, two hundred twenty-one".