21849418 has 16 divisors (see below), whose sum is σ = 33951456. Its totient is φ = 10538640.

The previous prime is 21849413. The next prime is 21849419. The reversal of 21849418 is 81494812.

It is not an unprimeable number, because it can be changed into a prime (21849413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5608 + ... + 8668.

It is an arithmetic number, because the mean of its divisors is an integer number (2121966).

Almost surely, 2^21849418 is an apocalyptic number.

21849418 is a deficient number, since it is larger than the sum of its proper divisors (12102038).

21849418 is a wasteful number, since it uses less digits than its factorization.

21849418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189.

The product of its digits is 18432, while the sum is 37.

The square root of 21849418 is about 4674.3361025925. The cubic root of 21849418 is about 279.5631708964.

The spelling of 21849418 in words is "twenty-one million, eight hundred forty-nine thousand, four hundred eighteen".