11121221331 has 12 divisors (see below), whose sum is σ = 17524348920. Its totient is φ = 6740134080.

The previous prime is 11121221311. The next prime is 11121221333. The reversal of 11121221331 is 13312212111.

11121221331 is a `hidden beast` number, since 1 + 112 + 1 + 221 + 331 = 666.

It is not a de Polignac number, because 11121221331 - 2⁷ = 11121221203 is a prime.

It is a super-2 number, since 2×11121221331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11121221333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56167686 + ... + 56167883.

It is an arithmetic number, because the mean of its divisors is an integer number (1460362410).

Almost surely, 2^11121221331 is an apocalyptic number.

11121221331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11121221331 is a deficient number, since it is larger than the sum of its proper divisors (6403127589).

11121221331 is a wasteful number, since it uses less digits than its factorization.

11121221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112335586 (or 112335583 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11121221331 its reverse (13312212111), we get a palindrome (24433433442).

The spelling of 11121221331 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, three hundred thirty-one".