75243021 has 16 divisors (see below), whose sum is σ = 120691200. Its totient is φ = 40732848.

The previous prime is 75243017. The next prime is 75243041. The reversal of 75243021 is 12034257.

It is not a de Polignac number, because 75243021 - 2² = 75243017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75242982 and 75243000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75243011) 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 15 ways as a sum of consecutive naturals, for example, 93891 + ... + 94688.

It is an arithmetic number, because the mean of its divisors is an integer number (7543200).

Almost surely, 2^75243021 is an apocalyptic number.

It is an amenable number.

75243021 is a deficient number, since it is larger than the sum of its proper divisors (45448179).

75243021 is a wasteful number, since it uses less digits than its factorization.

75243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188608.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 75243021 is about 8674.2735142489. The cubic root of 75243021 is about 422.1713345591.

Adding to 75243021 its reverse (12034257), we get a palindrome (87277278).

The spelling of 75243021 in words is "seventy-five million, two hundred forty-three thousand, twenty-one".