2211100021 has 8 divisors (see below), whose sum is σ = 2382894360. Its totient is φ = 2039549952.

The previous prime is 2211100013. The next prime is 2211100039. The reversal of 2211100021 is 1200011122.

It can be written as a sum of positive squares in 4 ways, for example, as 33477796 + 2177622225 = 5786^2 + 46665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2211100021 - 2³ = 2211100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211099980 and 2211100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211100321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42040 + ... + 78673.

It is an arithmetic number, because the mean of its divisors is an integer number (297861795).

Almost surely, 2^2211100021 is an apocalyptic number.

It is an amenable number.

2211100021 is a deficient number, since it is larger than the sum of its proper divisors (171794339).

2211100021 is a wasteful number, since it uses less digits than its factorization.

2211100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122135.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2211100021 is about 47022.3353418352. The cubic root of 2211100021 is about 1302.7751408562.

Adding to 2211100021 its reverse (1200011122), we get a palindrome (3411111143).

The spelling of 2211100021 in words is "two billion, two hundred eleven million, one hundred thousand, twenty-one".