211011100220 has 96 divisors (see below), whose sum is σ = 495121273920. Its totient is φ = 75069849600.

The previous prime is 211011100213. The next prime is 211011100231. The reversal of 211011100220 is 22001110112.

It is a congruent number.

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, 2549732 + ... + 2631188.

It is an arithmetic number, because the mean of its divisors is an integer number (5157513270).

Almost surely, 2^211011100220 is an apocalyptic number.

211011100220 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 211011100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247560636960).

211011100220 is an abundant number, since it is smaller than the sum of its proper divisors (284110173700).

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

211011100220 is a wasteful number, since it uses less digits than its factorization.

211011100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81903 (or 81901 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211011100220 its reverse (22001110112), we get a palindrome (233012210332).

The spelling of 211011100220 in words is "two hundred eleven billion, eleven million, one hundred thousand, two hundred twenty".