13221091 has 4 divisors (see below), whose sum is σ = 14238112. Its totient is φ = 12204072.

The previous prime is 13221083. The next prime is 13221101. The reversal of 13221091 is 19012231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13221091 - 2³ = 13221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221011) 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, 508491 + ... + 508516.

It is an arithmetic number, because the mean of its divisors is an integer number (3559528).

Almost surely, 2^13221091 is an apocalyptic number.

13221091 is a deficient number, since it is larger than the sum of its proper divisors (1017021).

13221091 is a wasteful number, since it uses less digits than its factorization.

13221091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017020.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 13221091 is about 3636.0818197615. The cubic root of 13221091 is about 236.4589543882.

The spelling of 13221091 in words is "thirteen million, two hundred twenty-one thousand, ninety-one".