13221081 has 24 divisors (see below), whose sum is σ = 19768320. Its totient is φ = 8509536.

The previous prime is 13221077. The next prime is 13221083. The reversal of 13221081 is 18012231.

It is not a de Polignac number, because 13221081 - 2² = 13221077 is a prime.

It is a super-2 number, since 2×13221081² = 349593965617122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13221083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49015 + ... + 49283.

It is an arithmetic number, because the mean of its divisors is an integer number (823680).

Almost surely, 2^13221081 is an apocalyptic number.

It is an amenable number.

13221081 is a deficient number, since it is larger than the sum of its proper divisors (6547239).

13221081 is a wasteful number, since it uses less digits than its factorization.

13221081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 13221081 is about 3636.0804446547. The cubic root of 13221081 is about 236.4588947716.

The spelling of 13221081 in words is "thirteen million, two hundred twenty-one thousand, eighty-one".