2111111220 has 96 divisors (see below), whose sum is σ = 6200345088. Its totient is φ = 536067072.

The previous prime is 2111111213. The next prime is 2111111291. The reversal of 2111111220 is 221111112.

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 = 2111111196 and 2111111205.

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, 94224 + ... + 114456.

It is an arithmetic number, because the mean of its divisors is an integer number (64586928).

Almost surely, 2^2111111220 is an apocalyptic number.

2111111220 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 2111111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3100172544).

2111111220 is an abundant number, since it is smaller than the sum of its proper divisors (4089233868).

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

2111111220 is a wasteful number, since it uses less digits than its factorization.

2111111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20329 (or 20327 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2111111220 is about 45946.8303585786. The cubic root of 2111111220 is about 1282.8337324813.

Adding to 2111111220 its reverse (221111112), we get a palindrome (2332222332).

The spelling of 2111111220 in words is "two billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".