11031203121 has 16 divisors (see below), whose sum is σ = 15366533760. Its totient is φ = 7025786240.

The previous prime is 11031203111. The next prime is 11031203129. The reversal of 11031203121 is 12130213011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11031203121 - 2¹¹ = 11031201073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11031203121.

It is not an unprimeable number, because it can be changed into a prime (11031203129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40716 + ... + 154013.

It is an arithmetic number, because the mean of its divisors is an integer number (960408360).

Almost surely, 2^11031203121 is an apocalyptic number.

It is an amenable number.

11031203121 is a deficient number, since it is larger than the sum of its proper divisors (4335330639).

11031203121 is a wasteful number, since it uses less digits than its factorization.

11031203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195576.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11031203121 its reverse (12130213011), we get a palindrome (23161416132).

The spelling of 11031203121 in words is "eleven billion, thirty-one million, two hundred three thousand, one hundred twenty-one".