211121222220 has 72 divisors (see below), whose sum is σ = 640489995600. Its totient is φ = 56291172480.

The previous prime is 211121222219. The next prime is 211121222227. The reversal of 211121222220 is 22222121112.

It is a happy number.

211121222220 is a `hidden beast` number, since 211 + 1 + 212 + 22 + 220 = 666.

211121222220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 = 211121222193 and 211121222202.

It is not an unprimeable number, because it can be changed into a prime (211121222227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1281135 + ... + 1436505.

Almost surely, 2^211121222220 is an apocalyptic number.

211121222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121222220 is an abundant number, since it is smaller than the sum of its proper divisors (429368773380).

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

211121222220 is a wasteful number, since it uses less digits than its factorization.

211121222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162935 (or 162930 counting only the distinct ones).

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

Adding to 211121222220 its reverse (22222121112), we get a palindrome (233343343332).

The spelling of 211121222220 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".