13221377 has 6 divisors (see below), whose sum is σ = 14316822. Its totient is φ = 12204192.

The previous prime is 13221353. The next prime is 13221379. The reversal of 13221377 is 77312231.

It can be written as a sum of positive squares in 3 ways, for example, as 1449616 + 11771761 = 1204^2 + 3431^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13221377 is a prime.

It is a super-2 number, since 2×13221377² = 349609619552258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13221379) 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 in 5 ways as a sum of consecutive naturals, for example, 38948 + ... + 39285.

It is an arithmetic number, because the mean of its divisors is an integer number (2386137).

Almost surely, 2^13221377 is an apocalyptic number.

It is an amenable number.

13221377 is a deficient number, since it is larger than the sum of its proper divisors (1095445).

13221377 is an equidigital number, since it uses as much as digits as its factorization.

13221377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78259 (or 78246 counting only the distinct ones).

The product of its digits is 1764, while the sum is 26.

The square root of 13221377 is about 3636.1211475967. The cubic root of 13221377 is about 236.4606594107.

The spelling of 13221377 in words is "thirteen million, two hundred twenty-one thousand, three hundred seventy-seven".