75813021 has 24 divisors (see below), whose sum is σ = 117736320. Its totient is φ = 46858176.

The previous prime is 75813007. The next prime is 75813029. The reversal of 75813021 is 12031857.

It is not a de Polignac number, because 75813021 - 2¹⁰ = 75811997 is a prime.

It is a super-2 number, since 2×75813021² = 11495228306292882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75813029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3321 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (4905680).

Almost surely, 2^75813021 is an apocalyptic number.

It is an amenable number.

75813021 is a deficient number, since it is larger than the sum of its proper divisors (41923299).

75813021 is a wasteful number, since it uses less digits than its factorization.

75813021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9505 (or 9502 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 75813021 is about 8707.0673019106. The cubic root of 75813021 is about 423.2347003284.

Adding to 75813021 its reverse (12031857), we get a palindrome (87844878).

The spelling of 75813021 in words is "seventy-five million, eight hundred thirteen thousand, twenty-one".