2121113131231 has 4 divisors (see below), whose sum is σ = 2121169676032. Its totient is φ = 2121056586432.

The previous prime is 2121113131229. The next prime is 2121113131279. The reversal of 2121113131231 is 1321313111212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121113131231 - 2¹ = 2121113131229 is a prime.

It is a super-3 number, since 3×2121113131231³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121113135231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28216095 + ... + 28291168.

It is an arithmetic number, because the mean of its divisors is an integer number (530292419008).

Almost surely, 2^{2121113131231} is an apocalyptic number.

2121113131231 is a deficient number, since it is larger than the sum of its proper divisors (56544801).

2121113131231 is an equidigital number, since it uses as much as digits as its factorization.

2121113131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56544800.

The product of its digits is 216, while the sum is 22.

Adding to 2121113131231 its reverse (1321313111212), we get a palindrome (3442426242443).

The spelling of 2121113131231 in words is "two trillion, one hundred twenty-one billion, one hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-one".