21443083 has 2 divisors, whose sum is σ = 21443084. Its totient is φ = 21443082.

The previous prime is 21443053. The next prime is 21443087. The reversal of 21443083 is 38034412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21443083 - 2¹³ = 21434891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21443087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721541 + 10721542.

It is an arithmetic number, because the mean of its divisors is an integer number (10721542).

Almost surely, 2^21443083 is an apocalyptic number.

21443083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443083 is an equidigital number, since it uses as much as digits as its factorization.

21443083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21443083 is about 4630.6676624435. The cubic root of 21443083 is about 277.8192975389.

Adding to 21443083 its reverse (38034412), we get a palindrome (59477495).

The spelling of 21443083 in words is "twenty-one million, four hundred forty-three thousand, eighty-three".