21826908 has 120 divisors (see below), whose sum is σ = 62203680. Its totient is φ = 6652800.

The previous prime is 21826901. The next prime is 21826943. The reversal of 21826908 is 80962812.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826901) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 216058 + ... + 216158.

It is an arithmetic number, because the mean of its divisors is an integer number (518364).

Almost surely, 2^21826908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21826908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31101840).

21826908 is an abundant number, since it is smaller than the sum of its proper divisors (40376772).

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

21826908 is a wasteful number, since it uses less digits than its factorization.

21826908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21826908 is about 4671.9276535494. The cubic root of 21826908 is about 279.4671328038.

The spelling of 21826908 in words is "twenty-one million, eight hundred twenty-six thousand, nine hundred eight".