21590841 has 8 divisors (see below), whose sum is σ = 28895104. Its totient is φ = 14340240.

The previous prime is 21590839. The next prime is 21590843. The reversal of 21590841 is 14809512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21590839) and next prime (21590843).

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

It is not a de Polignac number, because 21590841 - 2¹ = 21590839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21590799 and 21590808.

It is not an unprimeable number, because it can be changed into a prime (21590843) 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 in 7 ways as a sum of consecutive naturals, for example, 12466 + ... + 14091.

It is an arithmetic number, because the mean of its divisors is an integer number (3611888).

Almost surely, 2^21590841 is an apocalyptic number.

It is an amenable number.

21590841 is a deficient number, since it is larger than the sum of its proper divisors (7304263).

21590841 is a wasteful number, since it uses less digits than its factorization.

21590841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26831.

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

The square root of 21590841 is about 4646.5945594596. The cubic root of 21590841 is about 278.4559611998.

The spelling of 21590841 in words is "twenty-one million, five hundred ninety thousand, eight hundred forty-one".