Base | Representation |
---|---|
bin | 101000010001… |
… | …0000110100001 |
3 | 1110201120010100 |
4 | 1100202012201 |
5 | 20401024301 |
6 | 2032253013 |
7 | 344304456 |
oct | 120420641 |
9 | 43646110 |
10 | 21111201 |
11 | 10a0a181 |
12 | 70a1169 |
13 | 44b2147 |
14 | 2b3782d |
15 | 1cc0286 |
hex | 14221a1 |
21111201 has 12 divisors (see below), whose sum is σ = 31318612. Its totient is φ = 13693536.
The previous prime is 21111199. The next prime is 21111239. The reversal of 21111201 is 10211112.
It is a happy number.
It can be written as a sum of positive squares in 2 ways, for example, as 13950225 + 7160976 = 3735^2 + 2676^2 .
It is not a de Polignac number, because 21111201 - 21 = 21111199 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21111241) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31366 + ... + 32031.
Almost surely, 221111201 is an apocalyptic number.
It is an amenable number.
21111201 is a deficient number, since it is larger than the sum of its proper divisors (10207411).
21111201 is a wasteful number, since it uses less digits than its factorization.
21111201 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 63440 (or 63437 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 21111201 is about 4594.6926991911. The cubic root of 21111201 is about 276.3785369908.
Adding to 21111201 its reverse (10211112), we get a palindrome (31322313).
It can be divided in two parts, 21111 and 201, that added together give a palindrome (21312).
The spelling of 21111201 in words is "twenty-one million, one hundred eleven thousand, two hundred one".
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