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4223221 = 4619161
BaseRepresentation
bin10000000111000011110101
321221120011121
4100013003311
52040120341
6230303541
750616412
oct20070365
97846147
104223221
112424a72
1214b7bb1
13b4b362
147bd109
155864d1
hex4070f5

4223221 has 4 divisors (see below), whose sum is σ = 4232844. Its totient is φ = 4213600.

The previous prime is 4223207. The next prime is 4223231. The reversal of 4223221 is 1223224.

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 1380625 + 2842596 = 1175^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 4223221 - 25 = 4223189 is a prime.

It is a super-2 number, since 2×42232212 = 35671191229682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4223195 and 4223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223231) 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, 4120 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (1058211).

Almost surely, 24223221 is an apocalyptic number.

It is an amenable number.

4223221 is a deficient number, since it is larger than the sum of its proper divisors (9623).

4223221 is an equidigital number, since it uses as much as digits as its factorization.

4223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622.

The product of its digits is 192, while the sum is 16.

The square root of 4223221 is about 2055.0476880112. The cubic root of 4223221 is about 161.6396629476.

Adding to 4223221 its reverse (1223224), we get a palindrome (5446445).

It can be divided in two parts, 4223 and 221, that added together give a palindrome (4444).

The spelling of 4223221 in words is "four million, two hundred twenty-three thousand, two hundred twenty-one".

Divisors: 1 461 9161 4223221