21845683 has 4 divisors (see below), whose sum is σ = 22108968. Its totient is φ = 21582400.

The previous prime is 21845627. The next prime is 21845689. The reversal of 21845683 is 38654812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21845683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21845689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131518 + ... + 131683.

It is an arithmetic number, because the mean of its divisors is an integer number (5527242).

Almost surely, 2^21845683 is an apocalyptic number.

21845683 is a deficient number, since it is larger than the sum of its proper divisors (263285).

21845683 is an equidigital number, since it uses as much as digits as its factorization.

21845683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263284.

The product of its digits is 46080, while the sum is 37.

The square root of 21845683 is about 4673.9365635404. The cubic root of 21845683 is about 279.5472402212.

The spelling of 21845683 in words is "twenty-one million, eight hundred forty-five thousand, six hundred eighty-three".