20331112111 has 2 divisors, whose sum is σ = 20331112112. Its totient is φ = 20331112110.

The previous prime is 20331112093. The next prime is 20331112169. The reversal of 20331112111 is 11121113302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331112111 - 2¹⁷ = 20330981039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331112171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165556055 + 10165556056.

It is an arithmetic number, because the mean of its divisors is an integer number (10165556056).

Almost surely, 2^20331112111 is an apocalyptic number.

20331112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331112111 is an equidigital number, since it uses as much as digits as its factorization.

20331112111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20331112111 its reverse (11121113302), we get a palindrome (31452225413).

The spelling of 20331112111 in words is "twenty billion, three hundred thirty-one million, one hundred twelve thousand, one hundred eleven".