21271326 has 32 divisors (see below), whose sum is σ = 45048960. Its totient is φ = 6684384.

The previous prime is 21271319. The next prime is 21271331. The reversal of 21271326 is 62317212.

It is a junction number, because it is equal to n+sod(n) for n = 21271296 and 21271305.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6061 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (1407780).

Almost surely, 2^21271326 is an apocalyptic number.

21271326 is an abundant number, since it is smaller than the sum of its proper divisors (23777634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21271326 is a wasteful number, since it uses less digits than its factorization.

21271326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its digits is 1008, while the sum is 24.

The square root of 21271326 is about 4612.0847780586. The cubic root of 21271326 is about 277.0755397033.

Adding to 21271326 its reverse (62317212), we get a palindrome (83588538).

The spelling of 21271326 in words is "twenty-one million, two hundred seventy-one thousand, three hundred twenty-six".