2121110205 has 16 divisors (see below), whose sum is σ = 3409865664. Its totient is φ = 1125895680.

The previous prime is 2121110183. The next prime is 2121110219. The reversal of 2121110205 is 5020111212.

It is not a de Polignac number, because 2121110205 - 2¹⁹ = 2120585917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331924 + ... + 338253.

It is an arithmetic number, because the mean of its divisors is an integer number (213116604).

Almost surely, 2^2121110205 is an apocalyptic number.

It is an amenable number.

2121110205 is a deficient number, since it is larger than the sum of its proper divisors (1288755459).

2121110205 is a wasteful number, since it uses less digits than its factorization.

2121110205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670396.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2121110205 is about 46055.5122108093. The cubic root of 2121110205 is about 1284.8558645683.

Adding to 2121110205 its reverse (5020111212), we get a palindrome (7141221417).

The spelling of 2121110205 in words is "two billion, one hundred twenty-one million, one hundred ten thousand, two hundred five".