53420321 has 2 divisors, whose sum is σ = 53420322. Its totient is φ = 53420320.

The previous prime is 53420317. The next prime is 53420357. The reversal of 53420321 is 12302435.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53290000 + 130321 = 7300^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 53420321 - 2² = 53420317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53420293 and 53420302.

It is not a weakly prime, because it can be changed into another prime (53420371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26710160 + 26710161.

It is an arithmetic number, because the mean of its divisors is an integer number (26710161).

Almost surely, 2^53420321 is an apocalyptic number.

It is an amenable number.

53420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

53420321 is an equidigital number, since it uses as much as digits as its factorization.

53420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 53420321 is about 7308.9206453484. The cubic root of 53420321 is about 376.6189467135.

Adding to 53420321 its reverse (12302435), we get a palindrome (65722756).

The spelling of 53420321 in words is "fifty-three million, four hundred twenty thousand, three hundred twenty-one".