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13232221 = 19136917
BaseRepresentation
bin110010011110…
…100001011101
3220220021012021
4302132201131
511341412341
61151340141
7220320622
oct62364135
926807167
1013232221
117518622
124521651
132983b22
141a86349
1512659d1
hexc9e85d

13232221 has 4 divisors (see below), whose sum is σ = 13241052. Its totient is φ = 13223392.

The previous prime is 13232213. The next prime is 13232249. The reversal of 13232221 is 12223231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10169721 + 3062500 = 3189^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 13232221 - 23 = 13232213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13232195 and 13232204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13235221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546 + ... + 5371.

It is an arithmetic number, because the mean of its divisors is an integer number (3310263).

Almost surely, 213232221 is an apocalyptic number.

It is an amenable number.

13232221 is a deficient number, since it is larger than the sum of its proper divisors (8831).

13232221 is an equidigital number, since it uses as much as digits as its factorization.

13232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8830.

The product of its digits is 144, while the sum is 16.

The square root of 13232221 is about 3637.6119914032. The cubic root of 13232221 is about 236.5252890550.

Adding to 13232221 its reverse (12223231), we get a palindrome (25455452).

The spelling of 13232221 in words is "thirteen million, two hundred thirty-two thousand, two hundred twenty-one".

Divisors: 1 1913 6917 13232221