53502221 has 2 divisors, whose sum is σ = 53502222. Its totient is φ = 53502220.

The previous prime is 53502173. The next prime is 53502257. The reversal of 53502221 is 12220535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43705321 + 9796900 = 6611^2 + 3130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53502221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 53502193 and 53502202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53502521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26751110 + 26751111.

It is an arithmetic number, because the mean of its divisors is an integer number (26751111).

Almost surely, 2^53502221 is an apocalyptic number.

It is an amenable number.

53502221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53502221 is an equidigital number, since it uses as much as digits as its factorization.

53502221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 53502221 is about 7314.5212420226. The cubic root of 53502221 is about 376.8113163427.

Adding to 53502221 its reverse (12220535), we get a palindrome (65722756).

The spelling of 53502221 in words is "fifty-three million, five hundred two thousand, two hundred twenty-one".