21059841 has 8 divisors (see below), whose sum is σ = 30632544. Its totient is φ = 12763520.

The previous prime is 21059837. The next prime is 21059849. The reversal of 21059841 is 14895012.

It is a happy number.

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

It is not a de Polignac number, because 21059841 - 2² = 21059837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21059799 and 21059808.

It is not an unprimeable number, because it can be changed into a prime (21059849) 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, 319056 + ... + 319121.

It is an arithmetic number, because the mean of its divisors is an integer number (3829068).

Almost surely, 2^21059841 is an apocalyptic number.

It is an amenable number.

21059841 is a deficient number, since it is larger than the sum of its proper divisors (9572703).

21059841 is a wasteful number, since it uses less digits than its factorization.

21059841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638191.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21059841 is about 4589.1002386089. The cubic root of 21059841 is about 276.1542274970.

The spelling of 21059841 in words is "twenty-one million, fifty-nine thousand, eight hundred forty-one".