75200021 has 16 divisors (see below), whose sum is σ = 84268800. Its totient is φ = 66650688.

The previous prime is 75200003. The next prime is 75200023. The reversal of 75200021 is 12000257.

It is a de Polignac number, because none of the positive numbers 2^k-75200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75200023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37010 + ... + 38988.

It is an arithmetic number, because the mean of its divisors is an integer number (5266800).

Almost surely, 2^75200021 is an apocalyptic number.

It is an amenable number.

75200021 is a deficient number, since it is larger than the sum of its proper divisors (9068779).

75200021 is a wasteful number, since it uses less digits than its factorization.

75200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 75200021 is about 8671.7945662936. The cubic root of 75200021 is about 422.0908981884.

Adding to 75200021 its reverse (12000257), we get a palindrome (87200278).

The spelling of 75200021 in words is "seventy-five million, two hundred thousand, twenty-one".