2121233191 has 32 divisors (see below), whose sum is σ = 2827588608. Its totient is φ = 1540477440.

The previous prime is 2121233189. The next prime is 2121233201. The reversal of 2121233191 is 1913321212.

It is not a de Polignac number, because 2121233191 - 2¹ = 2121233189 is a prime.

It is a super-3 number, since 3×2121233191³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121233141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126961 + ... + 142693.

It is an arithmetic number, because the mean of its divisors is an integer number (88362144).

Almost surely, 2^2121233191 is an apocalyptic number.

2121233191 is a deficient number, since it is larger than the sum of its proper divisors (706355417).

2121233191 is a wasteful number, since it uses less digits than its factorization.

2121233191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15871.

The product of its digits is 648, while the sum is 25.

The square root of 2121233191 is about 46056.8473845095. The cubic root of 2121233191 is about 1284.8806968831.

It can be divided in two parts, 21 and 21233191, that added together give a palindrome (21233212).

The spelling of 2121233191 in words is "two billion, one hundred twenty-one million, two hundred thirty-three thousand, one hundred ninety-one".