21103363 has 2 divisors, whose sum is σ = 21103364. Its totient is φ = 21103362.

The previous prime is 21103339. The next prime is 21103373. The reversal of 21103363 is 36330112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103363 - 2¹⁷ = 20972291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21103363.

It is not a weakly prime, because it can be changed into another prime (21103373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551681 + 10551682.

It is an arithmetic number, because the mean of its divisors is an integer number (10551682).

Almost surely, 2^21103363 is an apocalyptic number.

21103363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103363 is an equidigital number, since it uses as much as digits as its factorization.

21103363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21103363 is about 4593.8396793967. The cubic root of 21103363 is about 276.3443288767.

Adding to 21103363 its reverse (36330112), we get a palindrome (57433475).

The spelling of 21103363 in words is "twenty-one million, one hundred three thousand, three hundred sixty-three".