21848109 has 8 divisors (see below), whose sum is σ = 29305920. Its totient is φ = 14477856.

The previous prime is 21848089. The next prime is 21848117. The reversal of 21848109 is 90184812.

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

It is not a de Polignac number, because 21848109 - 2⁹ = 21847597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21848109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848129) 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, 21304 + ... + 22305.

It is an arithmetic number, because the mean of its divisors is an integer number (3663240).

Almost surely, 2^21848109 is an apocalyptic number.

It is an amenable number.

21848109 is a deficient number, since it is larger than the sum of its proper divisors (7457811).

21848109 is a wasteful number, since it uses less digits than its factorization.

21848109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43779.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21848109 is about 4674.1960806111. The cubic root of 21848109 is about 279.5575879026.

The spelling of 21848109 in words is "twenty-one million, eight hundred forty-eight thousand, one hundred nine".