21324803 has 2 divisors, whose sum is σ = 21324804. Its totient is φ = 21324802.

The previous prime is 21324791. The next prime is 21324847. The reversal of 21324803 is 30842312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21324803 - 2⁶ = 21324739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21324883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662401 + 10662402.

It is an arithmetic number, because the mean of its divisors is an integer number (10662402).

Almost surely, 2^21324803 is an apocalyptic number.

21324803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324803 is an equidigital number, since it uses as much as digits as its factorization.

21324803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21324803 is about 4617.8786255163. The cubic root of 21324803 is about 277.3075385446.

The spelling of 21324803 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred three".