11121133221 has 80 divisors (see below), whose sum is σ = 18494042688. Its totient is φ = 6603379200.

The previous prime is 11121133207. The next prime is 11121133229. The reversal of 11121133221 is 12233112111.

It is not a de Polignac number, because 11121133221 - 2⁶ = 11121133157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121133194 and 11121133203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121133229) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 14386591 + ... + 14387363.

Almost surely, 2^11121133221 is an apocalyptic number.

11121133221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121133221 is a deficient number, since it is larger than the sum of its proper divisors (7372909467).

11121133221 is a wasteful number, since it uses less digits than its factorization.

11121133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1095 counting only the distinct ones).

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

Adding to 11121133221 its reverse (12233112111), we get a palindrome (23354245332).

The spelling of 11121133221 in words is "eleven billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty-one".