13220121311 has 4 divisors (see below), whose sum is σ = 13220395032. Its totient is φ = 13219847592.

The previous prime is 13220121307. The next prime is 13220121373. The reversal of 13220121311 is 11312102231.

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

It is a cyclic number.

It is not a de Polignac number, because 13220121311 - 2² = 13220121307 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 13220121311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220121011) 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, 42920 + ... + 168173.

It is an arithmetic number, because the mean of its divisors is an integer number (3305098758).

Almost surely, 2^13220121311 is an apocalyptic number.

13220121311 is a deficient number, since it is larger than the sum of its proper divisors (273721).

13220121311 is an equidigital number, since it uses as much as digits as its factorization.

13220121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273720.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13220121311 its reverse (11312102231), we get a palindrome (24532223542).

The spelling of 13220121311 in words is "thirteen billion, two hundred twenty million, one hundred twenty-one thousand, three hundred eleven".