75500021 has 8 divisors (see below), whose sum is σ = 78286080. Its totient is φ = 72726192.

The previous prime is 75500011. The next prime is 75500023. The reversal of 75500021 is 12000557.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75500021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75499966 and 75500002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75500023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10616 + ... + 16238.

It is an arithmetic number, because the mean of its divisors is an integer number (9785760).

Almost surely, 2^75500021 is an apocalyptic number.

It is an amenable number.

75500021 is a deficient number, since it is larger than the sum of its proper divisors (2786059).

75500021 is a wasteful number, since it uses less digits than its factorization.

75500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6115.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 75500021 is about 8689.0748069055. The cubic root of 75500021 is about 422.6514443722.

Adding to 75500021 its reverse (12000557), we get a palindrome (87500578).

The spelling of 75500021 in words is "seventy-five million, five hundred thousand, twenty-one".