21854944 has 12 divisors (see below), whose sum is σ = 43026984. Its totient is φ = 10927456.

The previous prime is 21854941. The next prime is 21854947. The reversal of 21854944 is 44945812.

It is an interprime number because it is at equal distance from previous prime (21854941) and next prime (21854947).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854941) 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 as a sum of consecutive naturals, namely, 341452 + ... + 341515.

It is an arithmetic number, because the mean of its divisors is an integer number (3585582).

Almost surely, 2^21854944 is an apocalyptic number.

It is an amenable number.

21854944 is a deficient number, since it is larger than the sum of its proper divisors (21172040).

21854944 is an equidigital number, since it uses as much as digits as its factorization.

21854944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682977 (or 682969 counting only the distinct ones).

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

The square root of 21854944 is about 4674.9271652080. The cubic root of 21854944 is about 279.5867372886.

The spelling of 21854944 in words is "twenty-one million, eight hundred fifty-four thousand, nine hundred forty-four".