21447683 has 2 divisors, whose sum is σ = 21447684. Its totient is φ = 21447682.

The previous prime is 21447611. The next prime is 21447689. The reversal of 21447683 is 38674412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21447683 - 2⁸ = 21447427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21447689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723841 + 10723842.

It is an arithmetic number, because the mean of its divisors is an integer number (10723842).

Almost surely, 2^21447683 is an apocalyptic number.

21447683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21447683 is an equidigital number, since it uses as much as digits as its factorization.

21447683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 21447683 is about 4631.1643244437. The cubic root of 21447683 is about 277.8391621792.

The spelling of 21447683 in words is "twenty-one million, four hundred forty-seven thousand, six hundred eighty-three".