21190003 has 2 divisors, whose sum is σ = 21190004. Its totient is φ = 21190002.

The previous prime is 21189977. The next prime is 21190051. The reversal of 21190003 is 30009112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21190003 - 2¹⁷ = 21058931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21190063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595001 + 10595002.

It is an arithmetic number, because the mean of its divisors is an integer number (10595002).

Almost surely, 2^21190003 is an apocalyptic number.

21190003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21190003 is an equidigital number, since it uses as much as digits as its factorization.

21190003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 21190003 is about 4603.2600404496. The cubic root of 21190003 is about 276.7219903558.

Adding to 21190003 its reverse (30009112), we get a palindrome (51199115).

The spelling of 21190003 in words is "twenty-one million, one hundred ninety thousand, three".