13440000221 has 4 divisors (see below), whose sum is σ = 13440235200. Its totient is φ = 13439765244.

The previous prime is 13440000193. The next prime is 13440000239. The reversal of 13440000221 is 12200004431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12200004431 = 107 ⋅114018733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13440000221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13440000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440000241) 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, 30140 + ... + 166698.

It is an arithmetic number, because the mean of its divisors is an integer number (3360058800).

Almost surely, 2^13440000221 is an apocalyptic number.

It is an amenable number.

13440000221 is a deficient number, since it is larger than the sum of its proper divisors (234979).

13440000221 is an equidigital number, since it uses as much as digits as its factorization.

13440000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234978.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 13440000221 its reverse (12200004431), we get a palindrome (25640004652).

The spelling of 13440000221 in words is "thirteen billion, four hundred forty million, two hundred twenty-one", and thus it is an aban number.