2121002111 has 4 divisors (see below), whose sum is σ = 2121103152. Its totient is φ = 2120901072.

The previous prime is 2121002101. The next prime is 2121002123. The reversal of 2121002111 is 1112001212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2121002111 - 2¹⁰ = 2121001087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121002092 and 2121002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121002101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5891 + ... + 65396.

It is an arithmetic number, because the mean of its divisors is an integer number (530275788).

Almost surely, 2^2121002111 is an apocalyptic number.

2121002111 is a deficient number, since it is larger than the sum of its proper divisors (101041).

2121002111 is an equidigital number, since it uses as much as digits as its factorization.

2121002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101040.

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

The square root of 2121002111 is about 46054.3386772625. The cubic root of 2121002111 is about 1284.8340383302.

Adding to 2121002111 its reverse (1112001212), we get a palindrome (3233003323).

The spelling of 2121002111 in words is "two billion, one hundred twenty-one million, two thousand, one hundred eleven".