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21848 = 232731

21848 has 8 divisors (see below), whose sum is σ = 40980. Its totient is φ = 10920.

The previous prime is 21841. The next prime is 21851. The reversal of 21848 is 84812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358 + ... + 1373.

21848 is a Friedman number, since it can be written as (8+4^8)/(2+1), using all its digits and the basic arithmetic operations.

221848 is an apocalyptic number.

It is an amenable number.

21848 is a deficient number, since it is larger than the sum of its proper divisors (19132).

21848 is a wasteful number, since it uses less digits than its factorization.

21848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2733 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 21848 is about 147.8106897352. The cubic root of 21848 is about 27.9557122998.

The spelling of 21848 in words is "twenty-one thousand, eight hundred forty-eight".

Divisors: 1 2 4 8 2731 5462 10924 21848