13221103212121 has 16 divisors (see below), whose sum is σ = 15929102499840. Its totient is φ = 10733477253840.

The previous prime is 13221103212089. The next prime is 13221103212151. The reversal of 13221103212121 is 12121230112231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13221103212121 - 2⁵ = 13221103212089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221103212092 and 13221103212101.

It is not an unprimeable number, because it can be changed into a prime (13221103212151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648146641 + ... + 648167038.

It is an arithmetic number, because the mean of its divisors is an integer number (995568906240).

Almost surely, 2^{13221103212121} is an apocalyptic number.

It is an amenable number.

13221103212121 is a deficient number, since it is larger than the sum of its proper divisors (2707999287719).

13221103212121 is a wasteful number, since it uses less digits than its factorization.

13221103212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296313764.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 13221103212121 its reverse (12121230112231), we get a palindrome (25342333324352).

The spelling of 13221103212121 in words is "thirteen trillion, two hundred twenty-one billion, one hundred three million, two hundred twelve thousand, one hundred twenty-one".