21083745 has 8 divisors (see below), whose sum is σ = 33734016. Its totient is φ = 11244656.

The previous prime is 21083719. The next prime is 21083773. The reversal of 21083745 is 54738012.

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 21083745 - 2⁹ = 21083233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702777 + ... + 702806.

It is an arithmetic number, because the mean of its divisors is an integer number (4216752).

Almost surely, 2^21083745 is an apocalyptic number.

It is an amenable number.

21083745 is a deficient number, since it is larger than the sum of its proper divisors (12650271).

21083745 is a wasteful number, since it uses less digits than its factorization.

21083745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405591.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21083745 is about 4591.7039320932. The cubic root of 21083745 is about 276.2586710627.

The spelling of 21083745 in words is "twenty-one million, eighty-three thousand, seven hundred forty-five".