21108083 has 2 divisors, whose sum is σ = 21108084. Its totient is φ = 21108082.

The previous prime is 21108077. The next prime is 21108097. The reversal of 21108083 is 38080112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21108083 - 2²⁴ = 4330867 is a prime.

It is not a weakly prime, because it can be changed into another prime (21108053) 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, 10554041 + 10554042.

It is an arithmetic number, because the mean of its divisors is an integer number (10554042).

Almost surely, 2^21108083 is an apocalyptic number.

21108083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21108083 is an equidigital number, since it uses as much as digits as its factorization.

21108083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21108083 is about 4594.3533821420. The cubic root of 21108083 is about 276.3649298270.

Adding to 21108083 its reverse (38080112), we get a palindrome (59188195).

The spelling of 21108083 in words is "twenty-one million, one hundred eight thousand, eighty-three".