11132311221 has 10 divisors (see below), whose sum is σ = 16629748982. Its totient is φ = 7421540760.

The previous prime is 11132311207. The next prime is 11132311231. The reversal of 11132311221 is 12211323111.

11132311221 is a `hidden beast` number, since 1 + 1 + 132 + 311 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6641435025 + 4490876196 = 81495^2 + 67014^2 .

It is not a de Polignac number, because 11132311221 - 2⁵ = 11132311189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11132311194 and 11132311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11132311231) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 68717890 + ... + 68718051.

Almost surely, 2^11132311221 is an apocalyptic number.

It is an amenable number.

11132311221 is a deficient number, since it is larger than the sum of its proper divisors (5497437761).

11132311221 is an equidigital number, since it uses as much as digits as its factorization.

11132311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137435953 (or 137435944 counting only the distinct ones).

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

Adding to 11132311221 its reverse (12211323111), we get a palindrome (23343634332).

The spelling of 11132311221 in words is "eleven billion, one hundred thirty-two million, three hundred eleven thousand, two hundred twenty-one".