211220222220 has 216 divisors, whose sum is σ = 749619181584. Its totient is φ = 47999492352.

The previous prime is 211220222189. The next prime is 211220222261. The reversal of 211220222220 is 22222022112.

211220222220 is a `hidden beast` number, since 2 + 1 + 1 + 220 + 222 + 220 = 666.

It is a super-2 number, since 2×211220222220² (a number of 23 digits) contains 22 as substring.

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 = 211220222193 and 211220222202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1456647 + ... + 1595073.

It is an arithmetic number, because the mean of its divisors is an integer number (3470459174).

Almost surely, 2^211220222220 is an apocalyptic number.

211220222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211220222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374809590792).

211220222220 is an abundant number, since it is smaller than the sum of its proper divisors (538398959364).

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

211220222220 is a wasteful number, since it uses less digits than its factorization.

211220222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138629 (or 138617 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 211220222220 its reverse (22222022112), we get a palindrome (233442244332).

The spelling of 211220222220 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty".