211111222220 has 12 divisors (see below), whose sum is σ = 443333566704. Its totient is φ = 84444488880.

The previous prime is 211111222219. The next prime is 211111222261. The reversal of 211111222220 is 22222111112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5277780536 + ... + 5277780575.

It is an arithmetic number, because the mean of its divisors is an integer number (36944463892).

Almost surely, 2^211111222220 is an apocalyptic number.

211111222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111222220 is an abundant number, since it is smaller than the sum of its proper divisors (232222344484).

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

211111222220 is a wasteful number, since it uses less digits than its factorization.

211111222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555561120 (or 10555561118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211111222220 its reverse (22222111112), we get a palindrome (233333333332).

The spelling of 211111222220 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty".