21854042 has 8 divisors (see below), whose sum is σ = 37464096. Its totient is φ = 9366012.

The previous prime is 21854011. The next prime is 21854051. The reversal of 21854042 is 24045812.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780488 + ... + 780515.

It is an arithmetic number, because the mean of its divisors is an integer number (4683012).

Almost surely, 2^21854042 is an apocalyptic number.

21854042 is a deficient number, since it is larger than the sum of its proper divisors (15610054).

21854042 is a wasteful number, since it uses less digits than its factorization.

21854042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561012.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 21854042 is about 4674.8306921214. The cubic root of 21854042 is about 279.5828908560.

Adding to 21854042 its reverse (24045812), we get a palindrome (45899854).

The spelling of 21854042 in words is "twenty-one million, eight hundred fifty-four thousand, forty-two".