21854116 has 12 divisors (see below), whose sum is σ = 38351488. Its totient is φ = 10896552.

The previous prime is 21854111. The next prime is 21854153. The reversal of 21854116 is 61145812.

It is a super-2 number, since 2×21854116² = 955204772282912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21854111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5976 + ... + 8911.

Almost surely, 2^21854116 is an apocalyptic number.

It is an amenable number.

21854116 is a deficient number, since it is larger than the sum of its proper divisors (16497372).

21854116 is a wasteful number, since it uses less digits than its factorization.

21854116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15258 (or 15256 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 21854116 is about 4674.8386068398. The cubic root of 21854116 is about 279.5832064210.

Adding to 21854116 its reverse (61145812), we get a palindrome (82999928).

The spelling of 21854116 in words is "twenty-one million, eight hundred fifty-four thousand, one hundred sixteen".