2111220111 has 64 divisors (see below), whose sum is σ = 3881880576. Its totient is φ = 984960000.

The previous prime is 2111220109. The next prime is 2111220113. The reversal of 2111220111 is 1110221112.

It is an interprime number because it is at equal distance from previous prime (2111220109) and next prime (2111220113).

It is not a de Polignac number, because 2111220111 - 2¹ = 2111220109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111220113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 101611 + ... + 120611.

It is an arithmetic number, because the mean of its divisors is an integer number (60654384).

Almost surely, 2^2111220111 is an apocalyptic number.

2111220111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2111220111 is a deficient number, since it is larger than the sum of its proper divisors (1770660465).

2111220111 is a wasteful number, since it uses less digits than its factorization.

2111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19072.

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

The square root of 2111220111 is about 45948.0153107836. The cubic root of 2111220111 is about 1282.8557882665.

Adding to 2111220111 its reverse (1110221112), we get a palindrome (3221441223).

It can be divided in two parts, 2111 and 220111, that added together give a palindrome (222222).

The spelling of 2111220111 in words is "two billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".