53016221 has 2 divisors, whose sum is σ = 53016222. Its totient is φ = 53016220.

The previous prime is 53016193. The next prime is 53016233. The reversal of 53016221 is 12261035.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28622500 + 24393721 = 5350^2 + 4939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53016221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53016193 and 53016202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53013221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26508110 + 26508111.

It is an arithmetic number, because the mean of its divisors is an integer number (26508111).

Almost surely, 2^53016221 is an apocalyptic number.

It is an amenable number.

53016221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53016221 is an equidigital number, since it uses as much as digits as its factorization.

53016221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 53016221 is about 7281.2238669059. The cubic root of 53016221 is about 375.6668927153. Note that the first 3 decimals are identical.

Adding to 53016221 its reverse (12261035), we get a palindrome (65277256).

The spelling of 53016221 in words is "fifty-three million, sixteen thousand, two hundred twenty-one".