Base | Representation |
---|---|
bin | 11010010111110… |
… | …00110010100001 |
3 | 120102021010210101 |
4 | 31023320302201 |
5 | 423113020001 |
6 | 33541302401 |
7 | 5324224162 |
oct | 1513706241 |
9 | 512233711 |
10 | 221220001 |
11 | 103966952 |
12 | 62104a01 |
13 | 36aa6b12 |
14 | 21547769 |
15 | 1464ba01 |
hex | d2f8ca1 |
221220001 has 4 divisors (see below), whose sum is σ = 223367872. Its totient is φ = 219072132.
The previous prime is 221219989. The next prime is 221220007. The reversal of 221220001 is 100022122.
221220001 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, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 221220001 - 223 = 212831393 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 221220001.
It is not an unprimeable number, because it can be changed into a prime (221220007) 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, 1073781 + ... + 1073986.
It is an arithmetic number, because the mean of its divisors is an integer number (55841968).
Almost surely, 2221220001 is an apocalyptic number.
It is an amenable number.
221220001 is a deficient number, since it is larger than the sum of its proper divisors (2147871).
221220001 is a wasteful number, since it uses less digits than its factorization.
221220001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2147870.
The product of its (nonzero) digits is 16, while the sum is 10.
The square root of 221220001 is about 14873.4663411056. The cubic root of 221220001 is about 604.7949135249.
Adding to 221220001 its reverse (100022122), we get a palindrome (321242123).
The spelling of 221220001 in words is "two hundred twenty-one million, two hundred twenty thousand, one".
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