21854408 has 16 divisors (see below), whose sum is σ = 43134000. Its totient is φ = 10352016.

The previous prime is 21854369. The next prime is 21854419. The reversal of 21854408 is 80445812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71738 + ... + 72041.

It is an arithmetic number, because the mean of its divisors is an integer number (2695875).

Almost surely, 2^21854408 is an apocalyptic number.

It is an amenable number.

21854408 is a deficient number, since it is larger than the sum of its proper divisors (21279592).

21854408 is a wasteful number, since it uses less digits than its factorization.

21854408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143804 (or 143800 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21854408 is about 4674.8698377602. The cubic root of 21854408 is about 279.5844516164.

The spelling of 21854408 in words is "twenty-one million, eight hundred fifty-four thousand, four hundred eight".