52206521 has 4 divisors (see below), whose sum is σ = 52221072. Its totient is φ = 52191972.

The previous prime is 52206493. The next prime is 52206551. The reversal of 52206521 is 12560225.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 52206521 - 2¹⁸ = 51944377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52206551) 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, 2366 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (13055268).

Almost surely, 2^52206521 is an apocalyptic number.

It is an amenable number.

52206521 is a deficient number, since it is larger than the sum of its proper divisors (14551).

52206521 is an equidigital number, since it uses as much as digits as its factorization.

52206521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14550.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 52206521 is about 7225.4080161607. The cubic root of 52206521 is about 373.7445924133.

Adding to 52206521 its reverse (12560225), we get a palindrome (64766746).

The spelling of 52206521 in words is "fifty-two million, two hundred six thousand, five hundred twenty-one".