20331122012111 has 4 divisors (see below), whose sum is σ = 21401181065400. Its totient is φ = 19261062958824.

The previous prime is 20331122012093. The next prime is 20331122012137. The reversal of 20331122012111 is 11121022113302.

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 20331122012111 - 2¹⁴ = 20331121995727 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 (20331122012161) 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, 535029526616 + ... + 535029526653.

It is an arithmetic number, because the mean of its divisors is an integer number (5350295266350).

Almost surely, 2^{20331122012111} is an apocalyptic number.

20331122012111 is a deficient number, since it is larger than the sum of its proper divisors (1070059053289).

20331122012111 is a wasteful number, since it uses less digits than its factorization.

20331122012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070059053288.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20331122012111 its reverse (11121022113302), we get a palindrome (31452144125413).

The spelling of 20331122012111 in words is "twenty trillion, three hundred thirty-one billion, one hundred twenty-two million, twelve thousand, one hundred eleven".