221111102120 has 16 divisors (see below), whose sum is σ = 497499979860. Its totient is φ = 88444440832.

The previous prime is 221111102083. The next prime is 221111102129. The reversal of 221111102120 is 21201111122.

It can be written as a sum of positive squares in 2 ways, for example, as 200863519684 + 20247582436 = 448178^2 + 142294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221111102095 and 221111102104.

It is not an unprimeable number, because it can be changed into a prime (221111102129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2763888737 + ... + 2763888816.

Almost surely, 2^221111102120 is an apocalyptic number.

221111102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111102120 is an abundant number, since it is smaller than the sum of its proper divisors (276388877740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221111102120 is a wasteful number, since it uses less digits than its factorization.

221111102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5527777564 (or 5527777560 counting only the distinct ones).

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

Adding to 221111102120 its reverse (21201111122), we get a palindrome (242312213242).

The spelling of 221111102120 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred two thousand, one hundred twenty".