52506021 has 4 divisors (see below), whose sum is σ = 70008032. Its totient is φ = 35004012.

The previous prime is 52506011. The next prime is 52506023. The reversal of 52506021 is 12060525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 52506021 - 2¹⁴ = 52489637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52506023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8751001 + ... + 8751006.

It is an arithmetic number, because the mean of its divisors is an integer number (17502008).

Almost surely, 2^52506021 is an apocalyptic number.

It is an amenable number.

52506021 is a deficient number, since it is larger than the sum of its proper divisors (17502011).

52506021 is a wasteful number, since it uses less digits than its factorization.

52506021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502010.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 52506021 is about 7246.1038496560. The cubic root of 52506021 is about 374.4579332584.

Adding to 52506021 its reverse (12060525), we get a palindrome (64566546).

The spelling of 52506021 in words is "fifty-two million, five hundred six thousand, twenty-one".