21199603 has 2 divisors, whose sum is σ = 21199604. Its totient is φ = 21199602.

The previous prime is 21199579. The next prime is 21199613. The reversal of 21199603 is 30699112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21199603 is a prime.

It is not a weakly prime, because it can be changed into another prime (21199613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599801 + 10599802.

It is an arithmetic number, because the mean of its divisors is an integer number (10599802).

Almost surely, 2^21199603 is an apocalyptic number.

21199603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199603 is an equidigital number, since it uses as much as digits as its factorization.

21199603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21199603 is about 4604.3026616416. The cubic root of 21199603 is about 276.7637731096.

The spelling of 21199603 in words is "twenty-one million, one hundred ninety-nine thousand, six hundred three".