56353021 has 2 divisors, whose sum is σ = 56353022. Its totient is φ = 56353020.

The previous prime is 56353001. The next prime is 56353027. The reversal of 56353021 is 12035365.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32205625 + 24147396 = 5675^2 + 4914^2 .

It is a cyclic number.

It is not a de Polignac number, because 56353021 - 2⁹ = 56352509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56353027) 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, 28176510 + 28176511.

It is an arithmetic number, because the mean of its divisors is an integer number (28176511).

Almost surely, 2^56353021 is an apocalyptic number.

It is an amenable number.

56353021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56353021 is an equidigital number, since it uses as much as digits as its factorization.

56353021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 56353021 is about 7506.8649248538. The cubic root of 56353021 is about 383.3884875061.

Adding to 56353021 its reverse (12035365), we get a palindrome (68388386).

The spelling of 56353021 in words is "fifty-six million, three hundred fifty-three thousand, twenty-one".