13220311 has 4 divisors (see below), whose sum is σ = 14237272. Its totient is φ = 12203352.

The previous prime is 13220309. The next prime is 13220329. The reversal of 13220311 is 11302231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11302231 = 47 ⋅240473.

It is a cyclic number.

It is not a de Polignac number, because 13220311 - 2¹ = 13220309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1016947 = 13220311 / (1 + 3 + 2 + 2 + 0 + 3 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220291 and 13220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220351) 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, 508461 + ... + 508486.

It is an arithmetic number, because the mean of its divisors is an integer number (3559318).

Almost surely, 2^13220311 is an apocalyptic number.

13220311 is a deficient number, since it is larger than the sum of its proper divisors (1016961).

13220311 is a wasteful number, since it uses less digits than its factorization.

13220311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016960.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 13220311 is about 3635.9745598670. The cubic root of 13220311 is about 236.4543042019.

Adding to 13220311 its reverse (11302231), we get a palindrome (24522542).

It can be divided in two parts, 13220 and 311, that added together give a palindrome (13531).

The spelling of 13220311 in words is "thirteen million, two hundred twenty thousand, three hundred eleven".