2111221011 has 4 divisors (see below), whose sum is σ = 2814961352. Its totient is φ = 1407480672.

The previous prime is 2111221003. The next prime is 2111221019. The reversal of 2111221011 is 1101221112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2111221003) and next prime (2111221019).

It is not a de Polignac number, because 2111221011 - 2³ = 2111221003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111221019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351870166 + ... + 351870171.

It is an arithmetic number, because the mean of its divisors is an integer number (703740338).

Almost surely, 2^2111221011 is an apocalyptic number.

2111221011 is a deficient number, since it is larger than the sum of its proper divisors (703740341).

2111221011 is an equidigital number, since it uses as much as digits as its factorization.

2111221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703740340.

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

The square root of 2111221011 is about 45948.0251044591. The cubic root of 2111221011 is about 1282.8559705576.

Adding to 2111221011 its reverse (1101221112), we get a palindrome (3212442123).

The spelling of 2111221011 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, eleven".