75134221 has 4 divisors (see below), whose sum is σ = 75157344. Its totient is φ = 75111100.

The previous prime is 75134219. The next prime is 75134299. The reversal of 75134221 is 12243157.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 75134221 - 2¹ = 75134219 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 (75134821) 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, 5695 + ... + 13516.

It is an arithmetic number, because the mean of its divisors is an integer number (18789336).

Almost surely, 2^75134221 is an apocalyptic number.

It is an amenable number.

75134221 is a deficient number, since it is larger than the sum of its proper divisors (23123).

75134221 is a wasteful number, since it uses less digits than its factorization.

75134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23122.

The product of its digits is 1680, while the sum is 25.

The square root of 75134221 is about 8667.9998269497. Note that the first 3 decimals coincide. The cubic root of 75134221 is about 421.9677524530.

Adding to 75134221 its reverse (12243157), we get a palindrome (87377378).

The spelling of 75134221 in words is "seventy-five million, one hundred thirty-four thousand, two hundred twenty-one".