21841366 has 8 divisors (see below), whose sum is σ = 32862024. Its totient is φ = 10887360.

The previous prime is 21841357. The next prime is 21841373. The reversal of 21841366 is 66314812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15835 + ... + 17158.

It is an arithmetic number, because the mean of its divisors is an integer number (4107753).

Almost surely, 2^21841366 is an apocalyptic number.

21841366 is a deficient number, since it is larger than the sum of its proper divisors (11020658).

21841366 is a wasteful number, since it uses less digits than its factorization.

21841366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33326.

The product of its digits is 6912, while the sum is 31.

The square root of 21841366 is about 4673.4747244422. The cubic root of 21841366 is about 279.5288249132.

The spelling of 21841366 in words is "twenty-one million, eight hundred forty-one thousand, three hundred sixty-six".