221111101111 has 8 divisors (see below), whose sum is σ = 225831720960. Its totient is φ = 216391153368.

The previous prime is 221111101093. The next prime is 221111101153. The reversal of 221111101111 is 111101111122.

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 221111101111 - 2²⁹ = 220574230199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221111101091 and 221111101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111108111) 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, 527350 + ... + 848716.

It is an arithmetic number, because the mean of its divisors is an integer number (28228965120).

Almost surely, 2^221111101111 is an apocalyptic number.

221111101111 is a deficient number, since it is larger than the sum of its proper divisors (4720619849).

221111101111 is a wasteful number, since it uses less digits than its factorization.

221111101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336053.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 221111101111 its reverse (111101111122), we get a palindrome (332212212233).

The spelling of 221111101111 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred one thousand, one hundred eleven".