21199363 has 2 divisors, whose sum is σ = 21199364. Its totient is φ = 21199362.

The previous prime is 21199361. The next prime is 21199369. The reversal of 21199363 is 36399112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21199363 - 2¹ = 21199361 is a prime.

Together with 21199361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21199361) 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, 10599681 + 10599682.

It is an arithmetic number, because the mean of its divisors is an integer number (10599682).

Almost surely, 2^21199363 is an apocalyptic number.

21199363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199363 is an equidigital number, since it uses as much as digits as its factorization.

21199363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 21199363 is about 4604.2765989892. The cubic root of 21199363 is about 276.7627286945.

The spelling of 21199363 in words is "twenty-one million, one hundred ninety-nine thousand, three hundred sixty-three".