21586041 has 8 divisors (see below), whose sum is σ = 31979360. Its totient is φ = 14390676.

The previous prime is 21586031. The next prime is 21586057. The reversal of 21586041 is 14068512.

21586041 is a `hidden beast` number, since 2 + 1 + 58 + 604 + 1 = 666.

It is not a de Polignac number, because 21586041 - 2⁷ = 21585913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 799483 = 21586041 / (2 + 1 + 5 + 8 + 6 + 0 + 4 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21585996 and 21586014.

It is not an unprimeable number, because it can be changed into a prime (21586001) by changing a digit.

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, 399715 + ... + 399768.

It is an arithmetic number, because the mean of its divisors is an integer number (3997420).

Almost surely, 2^21586041 is an apocalyptic number.

It is an amenable number.

21586041 is a deficient number, since it is larger than the sum of its proper divisors (10393319).

21586041 is an equidigital number, since it uses as much as digits as its factorization.

21586041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799492 (or 799486 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21586041 is about 4646.0780234516. The cubic root of 21586041 is about 278.4353245531.

The spelling of 21586041 in words is "twenty-one million, five hundred eighty-six thousand, forty-one".