11131221099 has 4 divisors (see below), whose sum is σ = 14841628136. Its totient is φ = 7420814064.

The previous prime is 11131221097. The next prime is 11131221103. The reversal of 11131221099 is 99012213111.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11131221099 - 2¹ = 11131221097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11131221097) 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, 1855203514 + ... + 1855203519.

It is an arithmetic number, because the mean of its divisors is an integer number (3710407034).

Almost surely, 2^11131221099 is an apocalyptic number.

11131221099 is a deficient number, since it is larger than the sum of its proper divisors (3710407037).

11131221099 is an equidigital number, since it uses as much as digits as its factorization.

11131221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710407036.

The product of its (nonzero) digits is 972, while the sum is 30.

The spelling of 11131221099 in words is "eleven billion, one hundred thirty-one million, two hundred twenty-one thousand, ninety-nine".