2211110021 has 4 divisors (see below), whose sum is σ = 2252829132. Its totient is φ = 2169390912.

The previous prime is 2211109997. The next prime is 2211110131. The reversal of 2211110021 is 1200111122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1094881921 + 1116228100 = 33089^2 + 33410^2 .

It is not a de Polignac number, because 2211110021 - 2¹⁰ = 2211108997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2211109984 and 2211110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211110521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20859476 + ... + 20859581.

It is an arithmetic number, because the mean of its divisors is an integer number (563207283).

Almost surely, 2^2211110021 is an apocalyptic number.

It is an amenable number.

2211110021 is a deficient number, since it is larger than the sum of its proper divisors (41719111).

2211110021 is an equidigital number, since it uses as much as digits as its factorization.

2211110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41719110.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2211110021 is about 47022.4416741623. The cubic root of 2211110021 is about 1302.7771048457. Note that the first 3 decimals are identical.

Adding to 2211110021 its reverse (1200111122), we get a palindrome (3411221143).

The spelling of 2211110021 in words is "two billion, two hundred eleven million, one hundred ten thousand, twenty-one".