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21886 = 231353
BaseRepresentation
bin101010101111110
31010000121
411111332
51200021
6245154
7120544
oct52576
933017
1021886
1115497
12107ba
139c67
147d94
156741
hex557e

21886 has 8 divisors (see below), whose sum is σ = 33984. Its totient is φ = 10560.

The previous prime is 21881. The next prime is 21893. The reversal of 21886 is 68812.

21886 = T21 + T22 + ... + T51.

21886 is nontrivially palindromic in base 5.

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

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115 + ... + 238.

It is an arithmetic number, because the mean of its divisors is an integer number (4248).

221886 is an apocalyptic number.

21886 is a deficient number, since it is larger than the sum of its proper divisors (12098).

21886 is a wasteful number, since it uses less digits than its factorization.

21886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 768, while the sum is 25.

The square root of 21886 is about 147.9391766910. The cubic root of 21886 is about 27.9719106059.

The spelling of 21886 in words is "twenty-one thousand, eight hundred eighty-six".

Divisors: 1 2 31 62 353 706 10943 21886