11131342221 has 4 divisors (see below), whose sum is σ = 14841789632. Its totient is φ = 7420894812.

The previous prime is 11131342213. The next prime is 11131342283. The reversal of 11131342221 is 12224313111.

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 11131342221 - 2³ = 11131342213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131342291) 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, 1855223701 + ... + 1855223706.

It is an arithmetic number, because the mean of its divisors is an integer number (3710447408).

Almost surely, 2^11131342221 is an apocalyptic number.

It is an amenable number.

11131342221 is a deficient number, since it is larger than the sum of its proper divisors (3710447411).

11131342221 is an equidigital number, since it uses as much as digits as its factorization.

11131342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710447410.

The product of its digits is 288, while the sum is 21.

Adding to 11131342221 its reverse (12224313111), we get a palindrome (23355655332).

The spelling of 11131342221 in words is "eleven billion, one hundred thirty-one million, three hundred forty-two thousand, two hundred twenty-one".