52212821 has 2 divisors, whose sum is σ = 52212822. Its totient is φ = 52212820.

The previous prime is 52212799. The next prime is 52212827. The reversal of 52212821 is 12821225.

52212821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 13586596 = 6215^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 52212821 - 2¹⁸ = 51950677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52212827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26106410 + 26106411.

It is an arithmetic number, because the mean of its divisors is an integer number (26106411).

Almost surely, 2^52212821 is an apocalyptic number.

It is an amenable number.

52212821 is a deficient number, since it is larger than the sum of its proper divisors (1).

52212821 is an equidigital number, since it uses as much as digits as its factorization.

52212821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 23.

The square root of 52212821 is about 7225.8439645484. The cubic root of 52212821 is about 373.7596256325.

The spelling of 52212821 in words is "fifty-two million, two hundred twelve thousand, eight hundred twenty-one".