21898826 has 8 divisors (see below), whose sum is σ = 32868480. Its totient is φ = 10942668.

The previous prime is 21898801. The next prime is 21898837. The reversal of 21898826 is 62889812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3425 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (4108560).

Almost surely, 2^21898826 is an apocalyptic number.

21898826 is a deficient number, since it is larger than the sum of its proper divisors (10969654).

21898826 is a wasteful number, since it uses less digits than its factorization.

21898826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6748.

The product of its digits is 110592, while the sum is 44.

The square root of 21898826 is about 4679.6181468150. The cubic root of 21898826 is about 279.7737372786.

The spelling of 21898826 in words is "twenty-one million, eight hundred ninety-eight thousand, eight hundred twenty-six".