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21198 = 233533
BaseRepresentation
bin101001011001110
31002002010
411023032
51134243
6242050
7115542
oct51316
932063
1021198
1114a21
1210326
139858
147a22
156433
hex52ce

21198 has 8 divisors (see below), whose sum is σ = 42408. Its totient is φ = 7064.

The previous prime is 21193. The next prime is 21211. The reversal of 21198 is 89112.

21198 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

21198 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191) 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, 1761 + ... + 1772.

It is an arithmetic number, because the mean of its divisors is an integer number (5301).

221198 is an apocalyptic number.

21198 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 (21204).

21198 is a wasteful number, since it uses less digits than its factorization.

21198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538.

The product of its digits is 144, while the sum is 21.

The square root of 21198 is about 145.5953295954. The cubic root of 21198 is about 27.6756797138.

The spelling of 21198 in words is "twenty-one thousand, one hundred ninety-eight".

Divisors: 1 2 3 6 3533 7066 10599 21198