21449353 has 2 divisors, whose sum is σ = 21449354. Its totient is φ = 21449352.

The previous prime is 21449297. The next prime is 21449387. The reversal of 21449353 is 35394412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 7884864 = 3683^2 + 2808^2 .

It is a cyclic number.

It is not a de Polignac number, because 21449353 - 2⁹ = 21448841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21449453) 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, 10724676 + 10724677.

It is an arithmetic number, because the mean of its divisors is an integer number (10724677).

Almost surely, 2^21449353 is an apocalyptic number.

It is an amenable number.

21449353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449353 is an equidigital number, since it uses as much as digits as its factorization.

21449353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 21449353 is about 4631.3446211657. The cubic root of 21449353 is about 277.8463732046.

The spelling of 21449353 in words is "twenty-one million, four hundred forty-nine thousand, three hundred fifty-three".