13220131121 has 8 divisors (see below), whose sum is σ = 13664601600. Its totient is φ = 12783007440.

The previous prime is 13220131109. The next prime is 13220131147. The reversal of 13220131121 is 12113102231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13220131121 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 13220131121.

It is not an unprimeable number, because it can be changed into a prime (13220131921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1833041 + ... + 1840238.

It is an arithmetic number, because the mean of its divisors is an integer number (1708075200).

Almost surely, 2^13220131121 is an apocalyptic number.

It is an amenable number.

13220131121 is a deficient number, since it is larger than the sum of its proper divisors (444470479).

13220131121 is an equidigital number, since it uses as much as digits as its factorization.

13220131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673399.

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

Adding to 13220131121 its reverse (12113102231), we get a palindrome (25333233352).

The spelling of 13220131121 in words is "thirteen billion, two hundred twenty million, one hundred thirty-one thousand, one hundred twenty-one".