20123111121112 has 8 divisors (see below), whose sum is σ = 37730833352100. Its totient is φ = 10061555560552.

The previous prime is 20123111121101. The next prime is 20123111121119. The reversal of 20123111121112 is 21112111132102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20123111121112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123111121119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257694445062 + ... + 1257694445077.

Almost surely, 2^{20123111121112} is an apocalyptic number.

It is an amenable number.

20123111121112 is a deficient number, since it is larger than the sum of its proper divisors (17607722230988).

20123111121112 is a wasteful number, since it uses less digits than its factorization.

20123111121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515388890145 (or 2515388890141 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 20123111121112 its reverse (21112111132102), we get a palindrome (41235222253214).

The spelling of 20123111121112 in words is "twenty trillion, one hundred twenty-three billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twelve".