20133231111 has 24 divisors (see below), whose sum is σ = 34008740480. Its totient is φ = 11237150736.

The previous prime is 20133231091. The next prime is 20133231163. The reversal of 20133231111 is 11113233102.

20133231111 is a `hidden beast` number, since 20 + 1 + 332 + 311 + 1 + 1 = 666.

It is not a de Polignac number, because 20133231111 - 2⁷ = 20133230983 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 (20133230111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3713281 + ... + 3718698.

Almost surely, 2^20133231111 is an apocalyptic number.

20133231111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20133231111 is a deficient number, since it is larger than the sum of its proper divisors (13875509369).

20133231111 is a wasteful number, since it uses less digits than its factorization.

20133231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7432035 (or 7432032 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20133231111 its reverse (11113233102), we get a palindrome (31246464213).

The spelling of 20133231111 in words is "twenty billion, one hundred thirty-three million, two hundred thirty-one thousand, one hundred eleven".