21896826 has 48 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 6162240.

The previous prime is 21896803. The next prime is 21896843. The reversal of 21896826 is 62869812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20350 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (1077300).

Almost surely, 2^21896826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21896826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855200).

21896826 is an abundant number, since it is smaller than the sum of its proper divisors (29813574).

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

21896826 is a wasteful number, since it uses less digits than its factorization.

21896826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1132 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 21896826 is about 4679.4044492863. The cubic root of 21896826 is about 279.7652198584.

It can be divided in two parts, 21896 and 826, that added together give a palindrome (22722).

The spelling of 21896826 in words is "twenty-one million, eight hundred ninety-six thousand, eight hundred twenty-six".