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2220221 = 10920369
BaseRepresentation
bin1000011110000010111101
311011210120102
420132002331
51032021341
6115330445
724604643
oct10360275
94153512
102220221
1112870a3
128b0a25
135c9753
1441b193
152dcc9b
hex21e0bd

2220221 has 4 divisors (see below), whose sum is σ = 2240700. Its totient is φ = 2199744.

The previous prime is 2220209. The next prime is 2220263. The reversal of 2220221 is 1220222.

2220221 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 1562500 + 657721 = 1250^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220221 - 26 = 2220157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10076 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (560175).

22220221 is an apocalyptic number.

It is an amenable number.

2220221 is a deficient number, since it is larger than the sum of its proper divisors (20479).

2220221 is a wasteful number, since it uses less digits than its factorization.

2220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2220221 is about 1490.0406034736. The cubic root of 2220221 is about 130.4564036735.

Adding to 2220221 its reverse (1220222), we get a palindrome (3440443).

Subtracting from 2220221 its reverse (1220222), we obtain a palindrome (999999).

The spelling of 2220221 in words is "two million, two hundred twenty thousand, two hundred twenty-one".

Divisors: 1 109 20369 2220221