13220203121 has 4 divisors (see below), whose sum is σ = 13316701092. Its totient is φ = 13123705152.

The previous prime is 13220203109. The next prime is 13220203147. The reversal of 13220203121 is 12130202231.

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 4364452096 + 8855751025 = 66064^2 + 94105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13220203121 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 13220203121.

It is not an unprimeable number, because it can be changed into a prime (13220203181) 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, 48248780 + ... + 48249053.

It is an arithmetic number, because the mean of its divisors is an integer number (3329175273).

Almost surely, 2^13220203121 is an apocalyptic number.

It is an amenable number.

13220203121 is a deficient number, since it is larger than the sum of its proper divisors (96497971).

13220203121 is an equidigital number, since it uses as much as digits as its factorization.

13220203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96497970.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13220203121 its reverse (12130202231), we get a palindrome (25350405352).

The spelling of 13220203121 in words is "thirteen billion, two hundred twenty million, two hundred three thousand, one hundred twenty-one".