53228221 has 2 divisors, whose sum is σ = 53228222. Its totient is φ = 53228220.

The previous prime is 53228213. The next prime is 53228249. The reversal of 53228221 is 12282235.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 2604996 = 7115^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 53228221 - 2³ = 53228213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53228251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26614110 + 26614111.

It is an arithmetic number, because the mean of its divisors is an integer number (26614111).

Almost surely, 2^53228221 is an apocalyptic number.

It is an amenable number.

53228221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53228221 is an equidigital number, since it uses as much as digits as its factorization.

53228221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 53228221 is about 7295.7673345578. The cubic root of 53228221 is about 376.1669626872.

The spelling of 53228221 in words is "fifty-three million, two hundred twenty-eight thousand, two hundred twenty-one".