21026841 has 32 divisors (see below), whose sum is σ = 33291648. Its totient is φ = 11658240.

The previous prime is 21026839. The next prime is 21026851. The reversal of 21026841 is 14862012.

It is not a de Polignac number, because 21026841 - 2¹ = 21026839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21026801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20251 + ... + 21263.

It is an arithmetic number, because the mean of its divisors is an integer number (1040364).

Almost surely, 2^21026841 is an apocalyptic number.

It is an amenable number.

21026841 is a deficient number, since it is larger than the sum of its proper divisors (12264807).

21026841 is a wasteful number, since it uses less digits than its factorization.

21026841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21026841 is about 4585.5033529592. The cubic root of 21026841 is about 276.0099109022.

Adding to 21026841 its reverse (14862012), we get a palindrome (35888853).

The spelling of 21026841 in words is "twenty-one million, twenty-six thousand, eight hundred forty-one".