2121431113 has 16 divisors (see below), whose sum is σ = 2242054080. Its totient is φ = 2004444736.

The previous prime is 2121431041. The next prime is 2121431129. The reversal of 2121431113 is 3111341212.

It is not a de Polignac number, because 2121431113 - 2¹³ = 2121422921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121431713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253431 + ... + 261667.

It is an arithmetic number, because the mean of its divisors is an integer number (140128380).

Almost surely, 2^2121431113 is an apocalyptic number.

It is an amenable number.

2121431113 is a deficient number, since it is larger than the sum of its proper divisors (120622967).

2121431113 is a wasteful number, since it uses less digits than its factorization.

2121431113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8456.

The product of its digits is 144, while the sum is 19.

The square root of 2121431113 is about 46058.9960051237. The cubic root of 2121431113 is about 1284.9206576395.

Adding to 2121431113 its reverse (3111341212), we get a palindrome (5232772325).

The spelling of 2121431113 in words is "two billion, one hundred twenty-one million, four hundred thirty-one thousand, one hundred thirteen".