20213231311231 has 12 divisors (see below), whose sum is σ = 24896488987008. Its totient is φ = 16306472317632.

The previous prime is 20213231311199. The next prime is 20213231311249. The reversal of 20213231311231 is 13211313231202.

It is not a de Polignac number, because 20213231311231 - 2⁵ = 20213231311199 is a prime.

It is a super-2 number, since 2×20213231311231² (a number of 27 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 = 20213231311196 and 20213231311205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213231311531) 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 11 ways as a sum of consecutive naturals, for example, 12132791071 + ... + 12132792736.

It is an arithmetic number, because the mean of its divisors is an integer number (2074707415584).

Almost surely, 2^{20213231311231} is an apocalyptic number.

20213231311231 is a deficient number, since it is larger than the sum of its proper divisors (4683257675777).

20213231311231 is a wasteful number, since it uses less digits than its factorization.

20213231311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24265583838 (or 24265583831 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20213231311231 its reverse (13211313231202), we get a palindrome (33424544542433).

The spelling of 20213231311231 in words is "twenty trillion, two hundred thirteen billion, two hundred thirty-one million, three hundred eleven thousand, two hundred thirty-one".