13221020122121 has 16 divisors (see below), whose sum is σ = 15279750241920. Its totient is φ = 11204797253760.

The previous prime is 13221020122117. The next prime is 13221020122133. The reversal of 13221020122121 is 12122102012231.

It is a cyclic number.

It is not a de Polignac number, because 13221020122121 - 2² = 13221020122117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221020122093 and 13221020122102.

It is not an unprimeable number, because it can be changed into a prime (13221020127121) 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, 52978166 + ... + 53227136.

It is an arithmetic number, because the mean of its divisors is an integer number (954984390120).

Almost surely, 2^{13221020122121} is an apocalyptic number.

It is an amenable number.

13221020122121 is a deficient number, since it is larger than the sum of its proper divisors (2058730119799).

13221020122121 is an equidigital number, since it uses as much as digits as its factorization.

13221020122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334304.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 13221020122121 its reverse (12122102012231), we get a palindrome (25343122134352).

The spelling of 13221020122121 in words is "thirteen trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".