21848213 has 8 divisors (see below), whose sum is σ = 23201280. Its totient is φ = 20502720.

The previous prime is 21848209. The next prime is 21848221. The reversal of 21848213 is 31284812.

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

It is a cyclic number.

It is not a de Polignac number, because 21848213 - 2² = 21848209 is a prime.

It is a super-2 number, since 2×21848213² = 954688822586738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4748 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (2900160).

Almost surely, 2^21848213 is an apocalyptic number.

It is an amenable number.

21848213 is a deficient number, since it is larger than the sum of its proper divisors (1353067).

21848213 is a wasteful number, since it uses less digits than its factorization.

21848213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787.

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

The square root of 21848213 is about 4674.2072055055. The cubic root of 21848213 is about 279.5580314794.

The spelling of 21848213 in words is "twenty-one million, eight hundred forty-eight thousand, two hundred thirteen".