11131454721 has 4 divisors (see below), whose sum is σ = 14841939632. Its totient is φ = 7420969812.

The previous prime is 11131454717. The next prime is 11131454731. The reversal of 11131454721 is 12745413111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11131454721 - 2² = 11131454717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11131454731) 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, 1855242451 + ... + 1855242456.

It is an arithmetic number, because the mean of its divisors is an integer number (3710484908).

Almost surely, 2^11131454721 is an apocalyptic number.

It is an amenable number.

11131454721 is a deficient number, since it is larger than the sum of its proper divisors (3710484911).

11131454721 is an equidigital number, since it uses as much as digits as its factorization.

11131454721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710484910.

The product of its digits is 3360, while the sum is 30.

Adding to 11131454721 its reverse (12745413111), we get a palindrome (23876867832).

The spelling of 11131454721 in words is "eleven billion, one hundred thirty-one million, four hundred fifty-four thousand, seven hundred twenty-one".