21683841 has 8 divisors (see below), whose sum is σ = 29278080. Its totient is φ = 14272752.

The previous prime is 21683839. The next prime is 21683843. The reversal of 21683841 is 14838612.

It is an interprime number because it is at equal distance from previous prime (21683839) and next prime (21683843).

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

It is not a de Polignac number, because 21683841 - 2¹ = 21683839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21683843) 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, 45510 + ... + 45983.

It is an arithmetic number, because the mean of its divisors is an integer number (3659760).

Almost surely, 2^21683841 is an apocalyptic number.

It is an amenable number.

21683841 is a deficient number, since it is larger than the sum of its proper divisors (7594239).

21683841 is an equidigital number, since it uses as much as digits as its factorization.

21683841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91575.

The product of its digits is 9216, while the sum is 33.

The square root of 21683841 is about 4656.5911351546. The cubic root of 21683841 is about 278.8551939302.

The spelling of 21683841 in words is "twenty-one million, six hundred eighty-three thousand, eight hundred forty-one".