21802326 has 64 divisors (see below), whose sum is σ = 54501888. Its totient is φ = 5660928.

The previous prime is 21802273. The next prime is 21802337. The reversal of 21802326 is 62320812.

It is a junction number, because it is equal to n+sod(n) for n = 21802296 and 21802305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39585 + ... + 40131.

It is an arithmetic number, because the mean of its divisors is an integer number (851592).

Almost surely, 2^21802326 is an apocalyptic number.

21802326 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21802326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27250944).

21802326 is an abundant number, since it is smaller than the sum of its proper divisors (32699562).

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

21802326 is a wasteful number, since it uses less digits than its factorization.

21802326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21802326 is about 4669.2960925604. The cubic root of 21802326 is about 279.3621791433.

The spelling of 21802326 in words is "twenty-one million, eight hundred two thousand, three hundred twenty-six".