2011110021 has 12 divisors (see below), whose sum is σ = 2934885772. Its totient is φ = 1326917376.

The previous prime is 2011110019. The next prime is 2011110077. The reversal of 2011110021 is 1200111102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1325979396 + 685130625 = 36414^2 + 26175^2 .

It is not a de Polignac number, because 2011110021 - 2¹ = 2011110019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011109985 and 2011110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011110011) 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 11 ways as a sum of consecutive naturals, for example, 1150966 + ... + 1152711.

Almost surely, 2^2011110021 is an apocalyptic number.

It is an amenable number.

2011110021 is a deficient number, since it is larger than the sum of its proper divisors (923775751).

2011110021 is a wasteful number, since it uses less digits than its factorization.

2011110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303780 (or 2303777 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2011110021 is about 44845.4013361459. The cubic root of 2011110021 is about 1262.2497015286.

Adding to 2011110021 its reverse (1200111102), we get a palindrome (3211221123).

The spelling of 2011110021 in words is "two billion, eleven million, one hundred ten thousand, twenty-one".