13221011112121 has 4 divisors (see below), whose sum is σ = 13221035267044. Its totient is φ = 13220986957200.

The previous prime is 13221011112037. The next prime is 13221011112151. The reversal of 13221011112121 is 12121111012231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5731834515625 + 7489176596496 = 2394125^2 + 2736636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221011112121 is a prime.

It is a super-2 number, since 2×13221011112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221011112151) 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, 11236950 + ... + 12357631.

It is an arithmetic number, because the mean of its divisors is an integer number (3305258816761).

Almost surely, 2^{13221011112121} is an apocalyptic number.

It is an amenable number.

13221011112121 is a deficient number, since it is larger than the sum of its proper divisors (24154923).

13221011112121 is an equidigital number, since it uses as much as digits as its factorization.

13221011112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24154922.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 13221011112121 its reverse (12121111012231), we get a palindrome (25342122124352).

The spelling of 13221011112121 in words is "thirteen trillion, two hundred twenty-one billion, eleven million, one hundred twelve thousand, one hundred twenty-one".