20112123111 has 8 divisors (see below), whose sum is σ = 27386721024. Its totient is φ = 13122803640.

The previous prime is 20112123107. The next prime is 20112123127. The reversal of 20112123111 is 11132121102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20112123111 - 2² = 20112123107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71319445 + ... + 71319726.

It is an arithmetic number, because the mean of its divisors is an integer number (3423340128).

Almost surely, 2^20112123111 is an apocalyptic number.

20112123111 is a deficient number, since it is larger than the sum of its proper divisors (7274597913).

20112123111 is a wasteful number, since it uses less digits than its factorization.

20112123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142639221.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20112123111 its reverse (11132121102), we get a palindrome (31244244213).

The spelling of 20112123111 in words is "twenty billion, one hundred twelve million, one hundred twenty-three thousand, one hundred eleven".