21324983 has 2 divisors, whose sum is σ = 21324984. Its totient is φ = 21324982.

The previous prime is 21324977. The next prime is 21325013. The reversal of 21324983 is 38942312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21324983 - 2⁸ = 21324727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324923) 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, 10662491 + 10662492.

It is an arithmetic number, because the mean of its divisors is an integer number (10662492).

Almost surely, 2^21324983 is an apocalyptic number.

21324983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324983 is an equidigital number, since it uses as much as digits as its factorization.

21324983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 21324983 is about 4617.8981149436. The cubic root of 21324983 is about 277.3083187819.

The spelling of 21324983 in words is "twenty-one million, three hundred twenty-four thousand, nine hundred eighty-three".