20321231333111 has 4 divisors (see below), whose sum is σ = 20324249493912. Its totient is φ = 20318213172312.

The previous prime is 20321231333099. The next prime is 20321231333177. The reversal of 20321231333111 is 11133313212302.

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 20321231333111 - 2¹⁸ = 20321231070967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321231330111) 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, 1509070301 + ... + 1509083766.

It is an arithmetic number, because the mean of its divisors is an integer number (5081062373478).

Almost surely, 2^{20321231333111} is an apocalyptic number.

20321231333111 is a deficient number, since it is larger than the sum of its proper divisors (3018160801).

20321231333111 is an equidigital number, since it uses as much as digits as its factorization.

20321231333111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018160800.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 20321231333111 its reverse (11133313212302), we get a palindrome (31454544545413).

The spelling of 20321231333111 in words is "twenty trillion, three hundred twenty-one billion, two hundred thirty-one million, three hundred thirty-three thousand, one hundred eleven".