21854853 has 20 divisors (see below), whose sum is σ = 34069728. Its totient is φ = 13935240.

The previous prime is 21854837. The next prime is 21854867. The reversal of 21854853 is 35845812.

It is a happy number.

It is not a de Polignac number, because 21854853 - 2⁴ = 21854837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4003 + ... + 7728.

Almost surely, 2^21854853 is an apocalyptic number.

21854853 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21854853 is a deficient number, since it is larger than the sum of its proper divisors (12214875).

21854853 is a wasteful number, since it uses less digits than its factorization.

21854853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11766 (or 11757 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 21854853 is about 4674.9174324259. The cubic root of 21854853 is about 279.5863492387.

The spelling of 21854853 in words is "twenty-one million, eight hundred fifty-four thousand, eight hundred fifty-three".