13221078 has 16 divisors (see below), whose sum is σ = 28476336. Its totient is φ = 4068000.

The previous prime is 13221077. The next prime is 13221083. The reversal of 13221078 is 87012231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84673 + ... + 84828.

It is an arithmetic number, because the mean of its divisors is an integer number (1779771).

Almost surely, 2^13221078 is an apocalyptic number.

13221078 is an abundant number, since it is smaller than the sum of its proper divisors (15255258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221078 is a wasteful number, since it uses less digits than its factorization.

13221078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169519.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 13221078 is about 3636.0800321225. The cubic root of 13221078 is about 236.4588768866.

The spelling of 13221078 in words is "thirteen million, two hundred twenty-one thousand, seventy-eight".