2121020011 has 24 divisors (see below), whose sum is σ = 2473595712. Its totient is φ = 1811040000.

The previous prime is 2121019997. The next prime is 2121020039. The reversal of 2121020011 is 1100201212.

It is not a de Polignac number, because 2121020011 - 2²¹ = 2118922859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020011.

It is not an unprimeable number, because it can be changed into a prime (2121020051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1544121 + ... + 1545493.

It is an arithmetic number, because the mean of its divisors is an integer number (103066488).

Almost surely, 2^2121020011 is an apocalyptic number.

2121020011 is a deficient number, since it is larger than the sum of its proper divisors (352575701).

2121020011 is a wasteful number, since it uses less digits than its factorization.

2121020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163 (or 2152 counting only the distinct ones).

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

The square root of 2121020011 is about 46054.5330125059. The cubic root of 2121020011 is about 1284.8376527325.

Adding to 2121020011 its reverse (1100201212), we get a palindrome (3221221223).

The spelling of 2121020011 in words is "two billion, one hundred twenty-one million, twenty thousand, eleven".