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13123321 = 41320081
BaseRepresentation
bin110010000011…
…111011111001
3220200201210221
4302003323321
511324421241
61145140041
7216355261
oct62037371
926621727
1013123321
117453822
12448a621
1329463a3
141a587a1
1512435d1
hexc83ef9

13123321 has 4 divisors (see below), whose sum is σ = 13443444. Its totient is φ = 12803200.

The previous prime is 13123307. The next prime is 13123339. The reversal of 13123321 is 12332131.

Adding to 13123321 its reverse (12332131), we get a palindrome (25455452).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12332131 = 71761733.

It can be written as a sum of positive squares in 2 ways, for example, as 3759721 + 9363600 = 1939^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123321 - 25 = 13123289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13123295 and 13123304.

It is not an unprimeable number, because it can be changed into a prime (13123301) 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, 160000 + ... + 160081.

It is an arithmetic number, because the mean of its divisors is an integer number (3360861).

Almost surely, 213123321 is an apocalyptic number.

It is an amenable number.

13123321 is a deficient number, since it is larger than the sum of its proper divisors (320123).

13123321 is an equidigital number, since it uses as much as digits as its factorization.

13123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320122.

The product of its digits is 108, while the sum is 16.

The square root of 13123321 is about 3622.6124551213. The cubic root of 13123321 is about 235.8746401638.

The spelling of 13123321 in words is "thirteen million, one hundred twenty-three thousand, three hundred twenty-one".

Divisors: 1 41 320081 13123321