13002721 has 2 divisors, whose sum is σ = 13002722. Its totient is φ = 13002720.

The previous prime is 13002709. The next prime is 13002767. The reversal of 13002721 is 12720031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 3111696 = 3145^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 13002721 - 2¹³ = 12994529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13002695 and 13002704.

It is not a weakly prime, because it can be changed into another prime (13002791) 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 as a sum of consecutive naturals, namely, 6501360 + 6501361.

It is an arithmetic number, because the mean of its divisors is an integer number (6501361).

Almost surely, 2^13002721 is an apocalyptic number.

It is an amenable number.

13002721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13002721 is an equidigital number, since it uses as much as digits as its factorization.

13002721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 13002721 is about 3605.9285905298. The cubic root of 13002721 is about 235.1498727089.

Adding to 13002721 its reverse (12720031), we get a palindrome (25722752).

The spelling of 13002721 in words is "thirteen million, two thousand, seven hundred twenty-one".