21080326 has 16 divisors (see below), whose sum is σ = 32682528. Its totient is φ = 10192000.

The previous prime is 21080321. The next prime is 21080333. The reversal of 21080326 is 62308012.

It is a junction number, because it is equal to n+sod(n) for n = 21080297 and 21080306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080321) 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, 6126 + ... + 8926.

It is an arithmetic number, because the mean of its divisors is an integer number (2042658).

Almost surely, 2^21080326 is an apocalyptic number.

21080326 is a deficient number, since it is larger than the sum of its proper divisors (11602202).

21080326 is a wasteful number, since it uses less digits than its factorization.

21080326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21080326 is about 4591.3316151200. The cubic root of 21080326 is about 276.2437372917.

Adding to 21080326 its reverse (62308012), we get a palindrome (83388338).

The spelling of 21080326 in words is "twenty-one million, eighty thousand, three hundred twenty-six".