13221278 has 16 divisors (see below), whose sum is σ = 23128800. Its totient is φ = 5665968.

The previous prime is 13221269. The next prime is 13221287. The reversal of 13221278 is 87212231.

It is an interprime number because it is at equal distance from previous prime (13221269) and next prime (13221287).

It is a super-3 number, since 3×13221278³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8951 + ... + 10322.

It is an arithmetic number, because the mean of its divisors is an integer number (1445550).

Almost surely, 2^13221278 is an apocalyptic number.

13221278 is a deficient number, since it is larger than the sum of its proper divisors (9907522).

13221278 is an equidigital number, since it uses as much as digits as its factorization.

13221278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19296 (or 19282 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 13221278 is about 3636.1075341634. The cubic root of 13221278 is about 236.4600692134.

The spelling of 13221278 in words is "thirteen million, two hundred twenty-one thousand, two hundred seventy-eight".