21083845 has 8 divisors (see below), whose sum is σ = 25330176. Its totient is φ = 16847376.

The previous prime is 21083837. The next prime is 21083849. The reversal of 21083845 is 54838012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21083845 - 2³ = 21083837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3604 + ... + 7426.

It is an arithmetic number, because the mean of its divisors is an integer number (3166272).

Almost surely, 2^21083845 is an apocalyptic number.

It is an amenable number.

21083845 is a deficient number, since it is larger than the sum of its proper divisors (4246331).

21083845 is a wasteful number, since it uses less digits than its factorization.

21083845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21083845 is about 4591.7148212841. The cubic root of 21083845 is about 276.2591078261.

The spelling of 21083845 in words is "twenty-one million, eighty-three thousand, eight hundred forty-five".