211121220222 has 24 divisors (see below), whose sum is σ = 499013793720. Its totient is φ = 63976127280.

The previous prime is 211121220221. The next prime is 211121220229. The reversal of 211121220222 is 222022121112.

It is a happy number.

211121220222 is a `hidden beast` number, since 211 + 1 + 212 + 20 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211121220195 and 211121220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121220221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 533134197 + ... + 533134592.

It is an arithmetic number, because the mean of its divisors is an integer number (20792241405).

Almost surely, 2^211121220222 is an apocalyptic number.

211121220222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211121220222 is an abundant number, since it is smaller than the sum of its proper divisors (287892573498).

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

211121220222 is a wasteful number, since it uses less digits than its factorization.

211121220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066268808 (or 1066268805 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211121220222 its reverse (222022121112), we get a palindrome (433143341334).

The spelling of 211121220222 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty-two".