21083903 has 2 divisors, whose sum is σ = 21083904. Its totient is φ = 21083902.

The previous prime is 21083897. The next prime is 21083911. The reversal of 21083903 is 30938012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21083903 - 2¹⁰ = 21082879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21082903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541951 + 10541952.

It is an arithmetic number, because the mean of its divisors is an integer number (10541952).

Almost surely, 2^21083903 is an apocalyptic number.

21083903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083903 is an equidigital number, since it uses as much as digits as its factorization.

21083903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21083903 is about 4591.7211370030. The cubic root of 21083903 is about 276.2593611482.

The spelling of 21083903 in words is "twenty-one million, eighty-three thousand, nine hundred three".