Base | Representation |
---|---|
bin | 11010011000011… |
… | …01000011101101 |
3 | 120102102100200012 |
4 | 31030031003231 |
5 | 423123144041 |
6 | 33543143005 |
7 | 5325021212 |
oct | 1514150355 |
9 | 512370605 |
10 | 221303021 |
11 | 103a13265 |
12 | 62144a65 |
13 | 36b05844 |
14 | 21569b09 |
15 | 146663eb |
hex | d30d0ed |
221303021 has 4 divisors (see below), whose sum is σ = 221332992. Its totient is φ = 221273052.
The previous prime is 221303009. The next prime is 221303063. The reversal of 221303021 is 120303122.
It is a happy number.
221303021 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, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-221303021 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 221302987 and 221303005.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (221303821) 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, 4790 + ... + 21576.
It is an arithmetic number, because the mean of its divisors is an integer number (55333248).
Almost surely, 2221303021 is an apocalyptic number.
It is an amenable number.
221303021 is a deficient number, since it is larger than the sum of its proper divisors (29971).
221303021 is a wasteful number, since it uses less digits than its factorization.
221303021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 29970.
The product of its (nonzero) digits is 72, while the sum is 14.
The square root of 221303021 is about 14876.2569552962. The cubic root of 221303021 is about 604.8705603830.
Adding to 221303021 its reverse (120303122), we get a palindrome (341606143).
The spelling of 221303021 in words is "two hundred twenty-one million, three hundred three thousand, twenty-one".
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