11143240221 has 4 divisors (see below), whose sum is σ = 14857653632. Its totient is φ = 7428826812.

The previous prime is 11143240219. The next prime is 11143240237. The reversal of 11143240221 is 12204234111.

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 11143240221 - 2¹ = 11143240219 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 (11143240021) 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, 1857206701 + ... + 1857206706.

It is an arithmetic number, because the mean of its divisors is an integer number (3714413408).

Almost surely, 2^11143240221 is an apocalyptic number.

It is an amenable number.

11143240221 is a deficient number, since it is larger than the sum of its proper divisors (3714413411).

11143240221 is an equidigital number, since it uses as much as digits as its factorization.

11143240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714413410.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 11143240221 its reverse (12204234111), we get a palindrome (23347474332).

The spelling of 11143240221 in words is "eleven billion, one hundred forty-three million, two hundred forty thousand, two hundred twenty-one".