21083205 has 32 divisors (see below), whose sum is σ = 39634560. Its totient is φ = 9434880.

The previous prime is 21083197. The next prime is 21083233. The reversal of 21083205 is 50238012.

It is not a de Polignac number, because 21083205 - 2³ = 21083197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2770 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (1238580).

Almost surely, 2^21083205 is an apocalyptic number.

It is an amenable number.

21083205 is a deficient number, since it is larger than the sum of its proper divisors (18551355).

21083205 is a wasteful number, since it uses less digits than its factorization.

21083205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21083205 is about 4591.6451300160. The cubic root of 21083205 is about 276.2563125166.

The spelling of 21083205 in words is "twenty-one million, eighty-three thousand, two hundred five".