52500021 has 24 divisors (see below), whose sum is σ = 85718880. Its totient is φ = 28419552.

The previous prime is 52500013. The next prime is 52500023. The reversal of 52500021 is 12000525.

It is not a de Polignac number, because 52500021 - 2³ = 52500013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52500023) 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, 6606 + ... + 12191.

It is an arithmetic number, because the mean of its divisors is an integer number (3571620).

Almost surely, 2^52500021 is an apocalyptic number.

It is an amenable number.

52500021 is a deficient number, since it is larger than the sum of its proper divisors (33218859).

52500021 is a wasteful number, since it uses less digits than its factorization.

52500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18833 (or 18826 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 52500021 is about 7245.6898222322. The cubic root of 52500021 is about 374.4436692867.

Adding to 52500021 its reverse (12000525), we get a palindrome (64500546).

The spelling of 52500021 in words is "fifty-two million, five hundred thousand, twenty-one".