11131203121 has 2 divisors, whose sum is σ = 11131203122. Its totient is φ = 11131203120.

The previous prime is 11131203113. The next prime is 11131203151. The reversal of 11131203121 is 12130213111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9884336400 + 1246866721 = 99420^2 + 35311^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131203121 - 2³ = 11131203113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11131203095 and 11131203104.

It is not a weakly prime, because it can be changed into another prime (11131203151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565601560 + 5565601561.

It is an arithmetic number, because the mean of its divisors is an integer number (5565601561).

Almost surely, 2^11131203121 is an apocalyptic number.

It is an amenable number.

11131203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131203121 is an equidigital number, since it uses as much as digits as its factorization.

11131203121 is an evil number, because the sum of its binary digits is even.

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

Adding to 11131203121 its reverse (12130213111), we get a palindrome (23261416232).

The spelling of 11131203121 in words is "eleven billion, one hundred thirty-one million, two hundred three thousand, one hundred twenty-one".