21828814 has 24 divisors (see below), whose sum is σ = 38257488. Its totient is φ = 9313920.

The previous prime is 21828803. The next prime is 21828823. The reversal of 21828814 is 41882812.

It is a self number, because there is not a number n which added to its sum of digits gives 21828814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34279 + ... + 34909.

It is an arithmetic number, because the mean of its divisors is an integer number (1594062).

Almost surely, 2^21828814 is an apocalyptic number.

21828814 is a deficient number, since it is larger than the sum of its proper divisors (16428674).

21828814 is a wasteful number, since it uses less digits than its factorization.

21828814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 993 counting only the distinct ones).

The product of its digits is 8192, while the sum is 34.

The square root of 21828814 is about 4672.1316334196. The cubic root of 21828814 is about 279.4752672412.

The spelling of 21828814 in words is "twenty-one million, eight hundred twenty-eight thousand, eight hundred fourteen".