21055846 has 8 divisors (see below), whose sum is σ = 36095760. Its totient is φ = 9023928.

The previous prime is 21055829. The next prime is 21055847. The reversal of 21055846 is 64855012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751981 + ... + 752008.

It is an arithmetic number, because the mean of its divisors is an integer number (4511970).

Almost surely, 2^21055846 is an apocalyptic number.

21055846 is a deficient number, since it is larger than the sum of its proper divisors (15039914).

21055846 is a wasteful number, since it uses less digits than its factorization.

21055846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503998.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 21055846 is about 4588.6649474548. The cubic root of 21055846 is about 276.1367644669.

The spelling of 21055846 in words is "twenty-one million, fifty-five thousand, eight hundred forty-six".