11201221111 has 8 divisors (see below), whose sum is σ = 11363201280. Its totient is φ = 11039745912.

The previous prime is 11201221081. The next prime is 11201221133. The reversal of 11201221111 is 11112210211.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11201221111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11201221091 and 11201221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201221151) 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, 81445 + ... + 170398.

It is an arithmetic number, because the mean of its divisors is an integer number (1420400160).

Almost surely, 2^11201221111 is an apocalyptic number.

11201221111 is a deficient number, since it is larger than the sum of its proper divisors (161980169).

11201221111 is an equidigital number, since it uses as much as digits as its factorization.

11201221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252485.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11201221111 its reverse (11112210211), we get a palindrome (22313431322).

The spelling of 11201221111 in words is "eleven billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".