Search a number
21102 = 233517
BaseRepresentation
bin101001001101110
31001221120
411021232
51133402
6241410
7115344
oct51156
931846
1021102
1114944
1210266
1397b3
147994
1563bc
hex526e

21102 has 8 divisors (see below), whose sum is σ = 42216. Its totient is φ = 7032.

The previous prime is 21101. The next prime is 21107. The reversal of 21102 is 20112.

Adding to 21102 its reverse (20112), we get a palindrome (41214).

Subtracting from 21102 its reverse (20112), we obtain a triangular number (990 = T44).

It can be divided in two parts, 2110 and 2, that added together give a palindrome (2112).

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (6), and also a Moran number because the ratio is a prime number: 3517 = 21102 / (2 + 1 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101) 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, 1753 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (5277).

221102 is an apocalyptic number.

21102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21108).

21102 is a wasteful number, since it uses less digits than its factorization.

21102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 21102 is about 145.2652745841. The cubic root of 21102 is about 27.6338379344.

The spelling of 21102 in words is "twenty-one thousand, one hundred two", and thus it is an iban number.

Divisors: 1 2 3 6 3517 7034 10551 21102