11111133221 has 8 divisors (see below), whose sum is σ = 11371376544. Its totient is φ = 10850973840.

The previous prime is 11111133191. The next prime is 11111133223. The reversal of 11111133221 is 12233111111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111133221 - 2⁶ = 11111133157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111133221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111133223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305591 + ... + 340011.

It is an arithmetic number, because the mean of its divisors is an integer number (1421422068).

Almost surely, 2^11111133221 is an apocalyptic number.

It is an amenable number.

11111133221 is a deficient number, since it is larger than the sum of its proper divisors (260243323).

11111133221 is an equidigital number, since it uses as much as digits as its factorization.

11111133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41971.

The product of its digits is 36, while the sum is 17.

Adding to 11111133221 its reverse (12233111111), we get a palindrome (23344244332).

The spelling of 11111133221 in words is "eleven billion, one hundred eleven million, one hundred thirty-three thousand, two hundred twenty-one".