21848117 has 2 divisors, whose sum is σ = 21848118. Its totient is φ = 21848116.

The previous prime is 21848089. The next prime is 21848129. The reversal of 21848117 is 71184812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21446161 + 401956 = 4631^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 21848117 - 2⁶ = 21848053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21848147) 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 as a sum of consecutive naturals, namely, 10924058 + 10924059.

It is an arithmetic number, because the mean of its divisors is an integer number (10924059).

Almost surely, 2^21848117 is an apocalyptic number.

It is an amenable number.

21848117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21848117 is an equidigital number, since it uses as much as digits as its factorization.

21848117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 32.

The square root of 21848117 is about 4674.1969363731. The cubic root of 21848117 is about 279.5576220239.

It can be divided in two parts, 2184 and 8117, that added together give a palindrome (10301).

The spelling of 21848117 in words is "twenty-one million, eight hundred forty-eight thousand, one hundred seventeen".