20321113231 has 4 divisors (see below), whose sum is σ = 20321407552. Its totient is φ = 20320818912.

The previous prime is 20321113207. The next prime is 20321113283. The reversal of 20321113231 is 13231112302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13231112302 = 2 ⋅6615556151.

It is a cyclic number.

It is not a de Polignac number, because 20321113231 - 2³³ = 11731178639 is a prime.

It is a super-2 number, since 2×20321113231² (a number of 21 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 = 20321113199 and 20321113208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321113531) 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, 18775 + ... + 202471.

It is an arithmetic number, because the mean of its divisors is an integer number (5080351888).

Almost surely, 2^20321113231 is an apocalyptic number.

20321113231 is a deficient number, since it is larger than the sum of its proper divisors (294321).

20321113231 is a wasteful number, since it uses less digits than its factorization.

20321113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294320.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20321113231 its reverse (13231112302), we get a palindrome (33552225533).

The spelling of 20321113231 in words is "twenty billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred thirty-one".