21588841 has 2 divisors, whose sum is σ = 21588842. Its totient is φ = 21588840.

The previous prime is 21588829. The next prime is 21588859. The reversal of 21588841 is 14888512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 10265616 = 3365^2 + 3204^2 .

It is a cyclic number.

It is not a de Polignac number, because 21588841 - 2⁷ = 21588713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21588841.

It is not a weakly prime, because it can be changed into another prime (21588811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10794420 + 10794421.

It is an arithmetic number, because the mean of its divisors is an integer number (10794421).

Almost surely, 2^21588841 is an apocalyptic number.

It is an amenable number.

21588841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21588841 is an equidigital number, since it uses as much as digits as its factorization.

21588841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20480, while the sum is 37.

The square root of 21588841 is about 4646.3793431015. The cubic root of 21588841 is about 278.4473629687.

The spelling of 21588841 in words is "twenty-one million, five hundred eighty-eight thousand, eight hundred forty-one".