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21201 = 337191

21201 has 8 divisors (see below), whose sum is σ = 29184. Its totient is φ = 13680.

The previous prime is 21193. The next prime is 21211. The reversal of 21201 is 10212.

It is a happy number.

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

It is not a de Polignac number, because 21201 - 23 = 21193 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201.

It is not an unprimeable number, because it can be changed into a prime (21211) 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 in 7 ways as a sum of consecutive naturals, for example, 16 + ... + 206.

It is an arithmetic number, because the mean of its divisors is an integer number (3648).

221201 is an apocalyptic number.

It is an amenable number.

21201 is a deficient number, since it is larger than the sum of its proper divisors (7983).

21201 is a wasteful number, since it uses less digits than its factorization.

21201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231.

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

The square root of 21201 is about 145.6056317592. The cubic root of 21201 is about 27.6769852319.

Adding to 21201 its reverse (10212), we get a palindrome (31413).

It can be divided in two parts, 21 and 201, that added together give a palindrome (222).

The spelling of 21201 in words is "twenty-one thousand, two hundred one", and thus it is an iban number.

Divisors: 1 3 37 111 191 573 7067 21201