21794118 has 8 divisors (see below), whose sum is σ = 43588248. Its totient is φ = 7264704.

The previous prime is 21794107. The next prime is 21794137. The reversal of 21794118 is 81149712.

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

21794118 is an admirable number.

It is a congruent number.

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, 1816171 + ... + 1816182.

It is an arithmetic number, because the mean of its divisors is an integer number (5448531).

Almost surely, 2^21794118 is an apocalyptic number.

21794118 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21794118 is a wasteful number, since it uses less digits than its factorization.

21794118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632358.

The product of its digits is 4032, while the sum is 33.

The square root of 21794118 is about 4668.4170764832. The cubic root of 21794118 is about 279.3271172485.

It can be divided in two parts, 21794 and 118, that added together give a palindrome (21912).

The spelling of 21794118 in words is "twenty-one million, seven hundred ninety-four thousand, one hundred eighteen".