2121313103231 has 16 divisors (see below), whose sum is σ = 2438310292800. Its totient is φ = 1807832355840.

The previous prime is 2121313103207. The next prime is 2121313103251. The reversal of 2121313103231 is 1323013131212.

It is a de Polignac number, because none of the positive numbers 2^k-2121313103231 is a prime.

It is a super-2 number, since 2×2121313103231² (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 = 2121313103197 and 2121313103206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121313103251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281006 + ... + 2078843.

It is an arithmetic number, because the mean of its divisors is an integer number (152394393300).

Almost surely, 2^{2121313103231} is an apocalyptic number.

2121313103231 is a deficient number, since it is larger than the sum of its proper divisors (316997189569).

2121313103231 is a wasteful number, since it uses less digits than its factorization.

2121313103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360594.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 2121313103231 its reverse (1323013131212), we get a palindrome (3444326234443).

The spelling of 2121313103231 in words is "two trillion, one hundred twenty-one billion, three hundred thirteen million, one hundred three thousand, two hundred thirty-one".