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BaseRepresentation
bin11010010111101…
…00001100110001
3120102020012000002
431023310030301
5423111414301
633541035345
75324115314
oct1513641461
9512205002
10221201201
11103953811
12620b5b55
1336a9b3b0
142154097b
151464616b
hexd2f4331

221201201 has 4 divisors (see below), whose sum is σ = 238216692. Its totient is φ = 204185712.

The previous prime is 221201179. The next prime is 221201203. The reversal of 221201201 is 102102122.

Adding to 221201201 its reverse (102102122), we get a palindrome (323303323).

It is a happy number.

221201201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 202322176 = 4345^2 + 14224^2 .

It is a cyclic number.

It is not a de Polignac number, because 221201201 - 26 = 221201137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201203) 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, 8507726 + ... + 8507751.

It is an arithmetic number, because the mean of its divisors is an integer number (59554173).

Almost surely, 2221201201 is an apocalyptic number.

It is an amenable number.

221201201 is a deficient number, since it is larger than the sum of its proper divisors (17015491).

221201201 is a wasteful number, since it uses less digits than its factorization.

221201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17015490.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221201201 is about 14872.8343297436. The cubic root of 221201201 is about 604.7777805556. Note that the first 4 decimals are identical.

The spelling of 221201201 in words is "two hundred twenty-one million, two hundred one thousand, two hundred one".

Divisors: 1 13 17015477 221201201