21083245 has 16 divisors (see below), whose sum is σ = 25909632. Its totient is φ = 16465600.

The previous prime is 21083239. The next prime is 21083263. The reversal of 21083245 is 54238012.

It is not a de Polignac number, because 21083245 - 2²³ = 12694637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41664 + ... + 42166.

It is an arithmetic number, because the mean of its divisors is an integer number (1619352).

Almost surely, 2^21083245 is an apocalyptic number.

It is an amenable number.

21083245 is a deficient number, since it is larger than the sum of its proper divisors (4826387).

21083245 is a wasteful number, since it uses less digits than its factorization.

21083245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21083245 is about 4591.6494857513. The cubic root of 21083245 is about 276.2564872251.

The spelling of 21083245 in words is "twenty-one million, eighty-three thousand, two hundred forty-five".