13203121111 has 4 divisors (see below), whose sum is σ = 13979775312. Its totient is φ = 12426466912.

The previous prime is 13203121093. The next prime is 13203121153. The reversal of 13203121111 is 11112130231.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13203121111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13203121511) 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, 388327075 + ... + 388327108.

It is an arithmetic number, because the mean of its divisors is an integer number (3494943828).

Almost surely, 2^13203121111 is an apocalyptic number.

13203121111 is a deficient number, since it is larger than the sum of its proper divisors (776654201).

13203121111 is an equidigital number, since it uses as much as digits as its factorization.

13203121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776654200.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13203121111 its reverse (11112130231), we get a palindrome (24315251342).

The spelling of 13203121111 in words is "thirteen billion, two hundred three million, one hundred twenty-one thousand, one hundred eleven".