2121331131 has 6 divisors (see below), whose sum is σ = 3064144980. Its totient is φ = 1414220748.

The previous prime is 2121331123. The next prime is 2121331139. The reversal of 2121331131 is 1311331212.

It is an interprime number because it is at equal distance from previous prime (2121331123) and next prime (2121331139).

It is not a de Polignac number, because 2121331131 - 2³ = 2121331123 is a prime.

It is a super-2 number, since 2×2121331131² = 9000091534699478322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121331139) 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, 117851721 + ... + 117851738.

It is an arithmetic number, because the mean of its divisors is an integer number (510690830).

Almost surely, 2^2121331131 is an apocalyptic number.

2121331131 is a deficient number, since it is larger than the sum of its proper divisors (942813849).

2121331131 is a wasteful number, since it uses less digits than its factorization.

2121331131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235703465 (or 235703462 counting only the distinct ones).

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

The square root of 2121331131 is about 46057.9106234749. The cubic root of 2121331131 is about 1284.9004714305.

Adding to 2121331131 its reverse (1311331212), we get a palindrome (3432662343).

The spelling of 2121331131 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, one hundred thirty-one".