211011222220 has 96 divisors (see below), whose sum is σ = 459890436096. Its totient is φ = 81241574400.

The previous prime is 211011222217. The next prime is 211011222239. The reversal of 211011222220 is 22222110112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211011222194 and 211011222203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109274655 + ... + 109276585.

It is an arithmetic number, because the mean of its divisors is an integer number (4790525376).

Almost surely, 2^211011222220 is an apocalyptic number.

211011222220 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 211011222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229945218048).

211011222220 is an abundant number, since it is smaller than the sum of its proper divisors (248879213876).

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

211011222220 is a wasteful number, since it uses less digits than its factorization.

211011222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831 (or 2829 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211011222220 its reverse (22222110112), we get a palindrome (233233332332).

The spelling of 211011222220 in words is "two hundred eleven billion, eleven million, two hundred twenty-two thousand, two hundred twenty".