53387221 has 2 divisors, whose sum is σ = 53387222. Its totient is φ = 53387220.

The previous prime is 53387183. The next prime is 53387233. The reversal of 53387221 is 12278335.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29484900 + 23902321 = 5430^2 + 4889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53387221 is a prime.

It is a super-2 number, since 2×53387221² = 5700390732205682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53387251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26693610 + 26693611.

It is an arithmetic number, because the mean of its divisors is an integer number (26693611).

Almost surely, 2^53387221 is an apocalyptic number.

It is an amenable number.

53387221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53387221 is an equidigital number, since it uses as much as digits as its factorization.

53387221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 53387221 is about 7306.6559382525. The cubic root of 53387221 is about 376.5411444682.

The spelling of 53387221 in words is "fifty-three million, three hundred eighty-seven thousand, two hundred twenty-one".