21854368 has 24 divisors (see below), whose sum is σ = 43636320. Its totient is φ = 10772160.

The previous prime is 21854341. The next prime is 21854369. The reversal of 21854368 is 86345812.

It is a happy number.

It is a super-2 number, since 2×21854368² = 955226801358848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21854369) by changing a digit.

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, 2538 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (1818180).

Almost surely, 2^21854368 is an apocalyptic number.

It is an amenable number.

21854368 is a deficient number, since it is larger than the sum of its proper divisors (21781952).

21854368 is an equidigital number, since it uses as much as digits as its factorization.

21854368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9700 (or 9692 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 21854368 is about 4674.8655595643. The cubic root of 21854368 is about 279.5842810423.

It can be divided in two parts, 21854 and 368, that added together give a palindrome (22222).

The spelling of 21854368 in words is "twenty-one million, eight hundred fifty-four thousand, three hundred sixty-eight".