11101122221 has 16 divisors (see below), whose sum is σ = 12824507520. Its totient is φ = 9412578240.

The previous prime is 11101122211. The next prime is 11101122259. The reversal of 11101122221 is 12222110111.

It is a cyclic number.

It is not a de Polignac number, because 11101122221 - 2¹⁰ = 11101121197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11101122196 and 11101122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101122211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271595 + ... + 309783.

It is an arithmetic number, because the mean of its divisors is an integer number (801531720).

Almost surely, 2^11101122221 is an apocalyptic number.

It is an amenable number.

11101122221 is a deficient number, since it is larger than the sum of its proper divisors (1723385299).

11101122221 is a wasteful number, since it uses less digits than its factorization.

11101122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38644.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11101122221 its reverse (12222110111), we get a palindrome (23323232332).

The spelling of 11101122221 in words is "eleven billion, one hundred one million, one hundred twenty-two thousand, two hundred twenty-one".