2121305211 has 6 divisors (see below), whose sum is σ = 3064107540. Its totient is φ = 1414203468.

The previous prime is 2121305177. The next prime is 2121305227. The reversal of 2121305211 is 1125031212.

2121305211 is a `hidden beast` number, since 2 + 12 + 130 + 521 + 1 = 666.

It is not a de Polignac number, because 2121305211 - 2⁷ = 2121305083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121303211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117850281 + ... + 117850298.

It is an arithmetic number, because the mean of its divisors is an integer number (510684590).

Almost surely, 2^2121305211 is an apocalyptic number.

2121305211 is a deficient number, since it is larger than the sum of its proper divisors (942802329).

2121305211 is a wasteful number, since it uses less digits than its factorization.

2121305211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235700585 (or 235700582 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 2121305211 is about 46057.6292377278. The cubic root of 2121305211 is about 1284.8952381196.

Adding to 2121305211 its reverse (1125031212), we get a palindrome (3246336423).

The spelling of 2121305211 in words is "two billion, one hundred twenty-one million, three hundred five thousand, two hundred eleven".