75021121 has 4 divisors (see below), whose sum is σ = 85738432. Its totient is φ = 64303812.

The previous prime is 75021109. The next prime is 75021137. The reversal of 75021121 is 12112057.

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 75021121 - 2¹¹ = 75019073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75021161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5358645 + ... + 5358658.

It is an arithmetic number, because the mean of its divisors is an integer number (21434608).

Almost surely, 2^75021121 is an apocalyptic number.

It is an amenable number.

75021121 is a deficient number, since it is larger than the sum of its proper divisors (10717311).

75021121 is a wasteful number, since it uses less digits than its factorization.

75021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717310.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 75021121 is about 8661.4733735087. The cubic root of 75021121 is about 421.7559159161.

Adding to 75021121 its reverse (12112057), we get a palindrome (87133178).

The spelling of 75021121 in words is "seventy-five million, twenty-one thousand, one hundred twenty-one".