211222111211220 has 96 divisors (see below), whose sum is σ = 597574604390400. Its totient is φ = 55740033552384.

The previous prime is 211222111211183. The next prime is 211222111211239. The reversal of 211222111211220 is 22112111222112.

It is a super-2 number, since 2×211222111211220² (a number of 29 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 61110061 + ... + 64473899.

It is an arithmetic number, because the mean of its divisors is an integer number (6224735462400).

Almost surely, 2^{211222111211220} is an apocalyptic number.

211222111211220 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 211222111211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298787302195200).

211222111211220 is an abundant number, since it is smaller than the sum of its proper divisors (386352493179180).

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

211222111211220 is a wasteful number, since it uses less digits than its factorization.

211222111211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3374737 (or 3374735 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211222111211220 its reverse (22112111222112), we get a palindrome (233334222433332).

The spelling of 211222111211220 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty".