21854241 has 6 divisors (see below), whose sum is σ = 31567250. Its totient is φ = 14569488.

The previous prime is 21854233. The next prime is 21854251. The reversal of 21854241 is 14245812.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 731025 = 4596^2 + 855^2 .

It is not a de Polignac number, because 21854241 - 2³ = 21854233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21854221) 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 5 ways as a sum of consecutive naturals, for example, 1214116 + ... + 1214133.

Almost surely, 2^21854241 is an apocalyptic number.

It is an amenable number.

21854241 is a deficient number, since it is larger than the sum of its proper divisors (9713009).

21854241 is a wasteful number, since it uses less digits than its factorization.

21854241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428255 (or 2428252 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21854241 is about 4674.8519762662. The cubic root of 21854241 is about 279.5837394683.

The spelling of 21854241 in words is "twenty-one million, eight hundred fifty-four thousand, two hundred forty-one".