21322003 has 2 divisors, whose sum is σ = 21322004. Its totient is φ = 21322002.

The previous prime is 21321991. The next prime is 21322019. The reversal of 21322003 is 30022312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21322003 - 2²¹ = 19224851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322043) 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, 10661001 + 10661002.

It is an arithmetic number, because the mean of its divisors is an integer number (10661002).

Almost surely, 2^21322003 is an apocalyptic number.

21322003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322003 is an equidigital number, since it uses as much as digits as its factorization.

21322003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21322003 is about 4617.5754460539. The cubic root of 21322003 is about 277.2954009554.

Adding to 21322003 its reverse (30022312), we get a palindrome (51344315).

The spelling of 21322003 in words is "twenty-one million, three hundred twenty-two thousand, three".