2111105220 has 144 divisors (see below), whose sum is σ = 7280824320. Its totient is φ = 454142976.

The previous prime is 2111105207. The next prime is 2111105233. The reversal of 2111105220 is 225011112.

It is an interprime number because it is at equal distance from previous prime (2111105207) and next prime (2111105233).

It is a super-2 number, since 2×2111105220² = 8913530499822496800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2111105220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28861 + ... + 71099.

It is an arithmetic number, because the mean of its divisors is an integer number (50561280).

Almost surely, 2^2111105220 is an apocalyptic number.

2111105220 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 2111105220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3640412160).

2111105220 is an abundant number, since it is smaller than the sum of its proper divisors (5169719100).

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

2111105220 is a wasteful number, since it uses less digits than its factorization.

2111105220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42282 (or 42273 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2111105220 is about 45946.7650656714. The cubic root of 2111105220 is about 1282.8325171641.

Adding to 2111105220 its reverse (225011112), we get a palindrome (2336116332).

The spelling of 2111105220 in words is "two billion, one hundred eleven million, one hundred five thousand, two hundred twenty".