13011221221 has 4 divisors (see below), whose sum is σ = 13045552000. Its totient is φ = 12976890444.

The previous prime is 13011221213. The next prime is 13011221257. The reversal of 13011221221 is 12212211031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13011221221 - 2³ = 13011221213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13011221195 and 13011221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011221281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17164821 + ... + 17165578.

It is an arithmetic number, because the mean of its divisors is an integer number (3261388000).

Almost surely, 2^13011221221 is an apocalyptic number.

It is an amenable number.

13011221221 is a deficient number, since it is larger than the sum of its proper divisors (34330779).

13011221221 is an equidigital number, since it uses as much as digits as its factorization.

13011221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34330778.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 13011221221 its reverse (12212211031), we get a palindrome (25223432252).

The spelling of 13011221221 in words is "thirteen billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".