13021331 has 2 divisors, whose sum is σ = 13021332. Its totient is φ = 13021330.

The previous prime is 13021277. The next prime is 13021357. The reversal of 13021331 is 13312031.

It is a strong prime.

It is an emirp because it is prime and its reverse (13312031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13021331 - 2¹⁰ = 13020307 is a prime.

It is a super-2 number, since 2×13021331² = 339110122023122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13021391) 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 as a sum of consecutive naturals, namely, 6510665 + 6510666.

It is an arithmetic number, because the mean of its divisors is an integer number (6510666).

Almost surely, 2^13021331 is an apocalyptic number.

13021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021331 is an equidigital number, since it uses as much as digits as its factorization.

13021331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 13021331 is about 3608.5081404924. The cubic root of 13021331 is about 235.2620044446.

Adding to 13021331 its reverse (13312031), we get a palindrome (26333362).

The spelling of 13021331 in words is "thirteen million, twenty-one thousand, three hundred thirty-one".