2121311331 has 6 divisors (see below), whose sum is σ = 3064116380. Its totient is φ = 1414207548.

The previous prime is 2121311329. The next prime is 2121311347. The reversal of 2121311331 is 1331131212.

2121311331 is a `hidden beast` number, since 2 + 1 + 21 + 311 + 331 = 666.

2121311331 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2121311331 - 2¹ = 2121311329 is a prime.

It is a super-2 number, since 2×2121311331² = 8999923526057983122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121311531) 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, 117850621 + ... + 117850638.

Almost surely, 2^2121311331 is an apocalyptic number.

2121311331 is a deficient number, since it is larger than the sum of its proper divisors (942805049).

2121311331 is a wasteful number, since it uses less digits than its factorization.

2121311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235701265 (or 235701262 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 2121311331 is about 46057.6956761842. The cubic root of 2121311331 is about 1284.8964737663.

Adding to 2121311331 its reverse (1331131212), we get a palindrome (3452442543).

The spelling of 2121311331 in words is "two billion, one hundred twenty-one million, three hundred eleven thousand, three hundred thirty-one".