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201121101 = 32171314517
BaseRepresentation
bin10111111110011…
…01110101001101
3112000110000021200
423333031311031
5402441333401
631542420113
74661333616
oct1377156515
9460400250
10201121101
11a3589295
1257431639
133288a68c
141c9d4c0d
15129cb686
hexbfcdd4d

201121101 has 12 divisors (see below), whose sum is σ = 307597212. Its totient is φ = 126193536.

The previous prime is 201121093. The next prime is 201121103. The reversal of 201121101 is 101121102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171636201 + 29484900 = 13101^2 + 5430^2 .

It is not a de Polignac number, because 201121101 - 23 = 201121093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 657106 + ... + 657411.

It is an arithmetic number, because the mean of its divisors is an integer number (25633101).

Almost surely, 2201121101 is an apocalyptic number.

It is an amenable number.

201121101 is a deficient number, since it is larger than the sum of its proper divisors (106476111).

201121101 is a wasteful number, since it uses less digits than its factorization.

201121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314540 (or 1314537 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 201121101 is about 14181.7171386261. The cubic root of 201121101 is about 585.8942186569.

Adding to 201121101 its reverse (101121102), we get a palindrome (302242203).

Subtracting from 201121101 its reverse (101121102), we obtain a palindrome (99999999).

The spelling of 201121101 in words is "two hundred one million, one hundred twenty-one thousand, one hundred one".

Divisors: 1 3 9 17 51 153 1314517 3943551 11830653 22346789 67040367 201121101