21284326 has 24 divisors (see below), whose sum is σ = 37937376. Its totient is φ = 8925840.

The previous prime is 21284299. The next prime is 21284339. The reversal of 21284326 is 62348212.

It is a junction number, because it is equal to n+sod(n) for n = 21284294 and 21284303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2296 + ... + 6916.

It is an arithmetic number, because the mean of its divisors is an integer number (1580724).

Almost surely, 2^21284326 is an apocalyptic number.

21284326 is a deficient number, since it is larger than the sum of its proper divisors (16653050).

21284326 is a wasteful number, since it uses less digits than its factorization.

21284326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684 (or 4677 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21284326 is about 4613.4939037567. The cubic root of 21284326 is about 277.1319732401.

It can be divided in two parts, 2 and 1284326, that multiplied together give a palindrome (2568652).

The spelling of 21284326 in words is "twenty-one million, two hundred eighty-four thousand, three hundred twenty-six".