2101111021 has 8 divisors (see below), whose sum is σ = 2174135040. Its totient is φ = 2029185312.

The previous prime is 2101111007. The next prime is 2101111027. The reversal of 2101111021 is 1201111012.

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 2101111021 - 2²¹ = 2099013869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101110989 and 2101111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111027) 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 7 ways as a sum of consecutive naturals, for example, 270685 + ... + 278338.

It is an arithmetic number, because the mean of its divisors is an integer number (271766880).

Almost surely, 2^2101111021 is an apocalyptic number.

It is an amenable number.

2101111021 is a deficient number, since it is larger than the sum of its proper divisors (73024019).

2101111021 is an equidigital number, since it uses as much as digits as its factorization.

2101111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549155.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2101111021 is about 45837.8775795739. The cubic root of 2101111021 is about 1280.8049585609.

Adding to 2101111021 its reverse (1201111012), we get a palindrome (3302222033).

Subtracting from 2101111021 its reverse (1201111012), we obtain a palindrome (900000009).

The spelling of 2101111021 in words is "two billion, one hundred one million, one hundred eleven thousand, twenty-one".