21848321 has 8 divisors (see below), whose sum is σ = 24871104. Its totient is φ = 18998320.

The previous prime is 21848303. The next prime is 21848327. The reversal of 21848321 is 12384812.

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

It is not a de Polignac number, because 21848321 - 2¹⁰ = 21847297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21848327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42926 + ... + 43431.

It is an arithmetic number, because the mean of its divisors is an integer number (3108888).

Almost surely, 2^21848321 is an apocalyptic number.

It is an amenable number.

21848321 is a deficient number, since it is larger than the sum of its proper divisors (3022783).

21848321 is a wasteful number, since it uses less digits than its factorization.

21848321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86391.

The product of its digits is 3072, while the sum is 29.

The square root of 21848321 is about 4674.2187582525. The cubic root of 21848321 is about 279.5584921153.

The spelling of 21848321 in words is "twenty-one million, eight hundred forty-eight thousand, three hundred twenty-one".