13121000221 has 12 divisors (see below), whose sum is σ = 15826203552. Its totient is φ = 10654644744.

The previous prime is 13121000209. The next prime is 13121000227. The reversal of 13121000221 is 12200012131.

It is not a de Polignac number, because 13121000221 - 2¹⁷ = 13120869149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121000227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2593635 + ... + 2598688.

It is an arithmetic number, because the mean of its divisors is an integer number (1318850296).

Almost surely, 2^13121000221 is an apocalyptic number.

It is an amenable number.

13121000221 is a deficient number, since it is larger than the sum of its proper divisors (2705203331).

13121000221 is an equidigital number, since it uses as much as digits as its factorization.

13121000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192368 (or 5192349 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 13121000221 its reverse (12200012131), we get a palindrome (25321012352).

The spelling of 13121000221 in words is "thirteen billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.