211111111020 has 96 divisors (see below), whose sum is σ = 597206393280. Its totient is φ = 55716249600.

The previous prime is 211111110923. The next prime is 211111111027. The reversal of 211111111020 is 20111111112.

211111111020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211111110987 and 211111111005.

It is not an unprimeable number, because it can be changed into a prime (211111111027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19198644 + ... + 19209636.

It is an arithmetic number, because the mean of its divisors is an integer number (6220899930).

Almost surely, 2^211111111020 is an apocalyptic number.

211111111020 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 211111111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298603196640).

211111111020 is an abundant number, since it is smaller than the sum of its proper divisors (386095282260).

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

211111111020 is a wasteful number, since it uses less digits than its factorization.

211111111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14275 (or 14273 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 211111111020 its reverse (20111111112), we get a palindrome (231222222132).

The spelling of 211111111020 in words is "two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, twenty".