21332826 has 48 divisors (see below), whose sum is σ = 47567520. Its totient is φ = 6907680.

The previous prime is 21332821. The next prime is 21332837. The reversal of 21332826 is 62823312.

It is a self number, because there is not a number n which added to its sum of digits gives 21332826.

It is not an unprimeable number, because it can be changed into a prime (21332821) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 162781 + ... + 162911.

It is an arithmetic number, because the mean of its divisors is an integer number (990990).

Almost surely, 2^21332826 is an apocalyptic number.

21332826 is an abundant number, since it is smaller than the sum of its proper divisors (26234694).

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

21332826 is a wasteful number, since it uses less digits than its factorization.

21332826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 328 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21332826 is about 4618.7472327461. The cubic root of 21332826 is about 277.3423111898.

The spelling of 21332826 in words is "twenty-one million, three hundred thirty-two thousand, eight hundred twenty-six".