21083263 has 2 divisors, whose sum is σ = 21083264. Its totient is φ = 21083262.

The previous prime is 21083239. The next prime is 21083267. The reversal of 21083263 is 36238012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21083263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21083267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541631 + 10541632.

It is an arithmetic number, because the mean of its divisors is an integer number (10541632).

Almost surely, 2^21083263 is an apocalyptic number.

21083263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083263 is an equidigital number, since it uses as much as digits as its factorization.

21083263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21083263 is about 4591.6514458308. The cubic root of 21083263 is about 276.2565658438.

The spelling of 21083263 in words is "twenty-one million, eighty-three thousand, two hundred sixty-three".