Adding to 20321111413 its reverse (31411112302), we get a palindrome (51732223715).
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31411112302 = 2 ⋅15705556151.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 220321111413 is an apocalyptic number.
It is an amenable number.
20321111413 is an equidigital number, since it uses as much as digits as its factorization.
20321111413 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 655519754.
The spelling of 20321111413 in words is "twenty billion, three hundred twenty-one million, one hundred eleven thousand, four hundred thirteen".