11101231221 has 8 divisors (see below), whose sum is σ = 15445191360. Its totient is φ = 7079045952.

The previous prime is 11101231187. The next prime is 11101231231. The reversal of 11101231221 is 12213210111.

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

It is not a de Polignac number, because 11101231221 - 2⁶ = 11101231157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11101231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101231231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80443636 + ... + 80443773.

It is an arithmetic number, because the mean of its divisors is an integer number (1930648920).

Almost surely, 2^11101231221 is an apocalyptic number.

It is an amenable number.

11101231221 is a deficient number, since it is larger than the sum of its proper divisors (4343960139).

11101231221 is a wasteful number, since it uses less digits than its factorization.

11101231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160887435.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11101231221 its reverse (12213210111), we get a palindrome (23314441332).

The spelling of 11101231221 in words is "eleven billion, one hundred one million, two hundred thirty-one thousand, two hundred twenty-one".