211211222220000 has 960 divisors, whose sum is σ = 779013181235520. Its totient is φ = 55650816000000.

The previous prime is 211211222219999. The next prime is 211211222220059. The reversal of 211211222220000 is 22222112112.

It is a happy number.

211211222220000 is a `hidden beast` number, since 2 + 11 + 211 + 222 + 220 + 0 + 0 + 0 = 666.

It is a super-2 number, since 2×211211222220000² (a number of 29 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 28415336284 + ... + 28415343716.

It is an arithmetic number, because the mean of its divisors is an integer number (811472063787).

Almost surely, 2^{211211222220000} is an apocalyptic number.

211211222220000 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 211211222220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389506590617760).

211211222220000 is an abundant number, since it is smaller than the sum of its proper divisors (567801959015520).

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

211211222220000 is a wasteful number, since it uses less digits than its factorization.

211211222220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8094 (or 8065 counting only the distinct ones).

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

Adding to 211211222220000 its reverse (22222112112), we get a palindrome (211233444332112).

The spelling of 211211222220000 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty thousand".