2121613223231 has 4 divisors (see below), whose sum is σ = 2121753177264. Its totient is φ = 2121473269200.

The previous prime is 2121613223203. The next prime is 2121613223239. The reversal of 2121613223231 is 1323223161212.

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 2121613223231 - 2²⁶ = 2121546114367 is a prime.

It is a super-2 number, since 2×2121613223231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121613223194 and 2121613223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121613223239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69954275 + ... + 69984596.

It is an arithmetic number, because the mean of its divisors is an integer number (530438294316).

Almost surely, 2^{2121613223231} is an apocalyptic number.

2121613223231 is a deficient number, since it is larger than the sum of its proper divisors (139954033).

2121613223231 is a wasteful number, since it uses less digits than its factorization.

2121613223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139954032.

The product of its digits is 5184, while the sum is 29.

Adding to 2121613223231 its reverse (1323223161212), we get a palindrome (3444836384443).

The spelling of 2121613223231 in words is "two trillion, one hundred twenty-one billion, six hundred thirteen million, two hundred twenty-three thousand, two hundred thirty-one".