20120111102005 has 16 divisors (see below), whose sum is σ = 25543886734080. Its totient is φ = 15171520577472.

The previous prime is 20120111101957. The next prime is 20120111102029. The reversal of 20120111102005 is 50020111102102.

It is a cyclic number.

It is not a de Polignac number, because 20120111102005 - 2²⁵ = 20120077547573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120111102005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537520989 + ... + 537558418.

It is an arithmetic number, because the mean of its divisors is an integer number (1596492920880).

Almost surely, 2^{20120111102005} is an apocalyptic number.

It is an amenable number.

20120111102005 is a deficient number, since it is larger than the sum of its proper divisors (5423775632075).

20120111102005 is a wasteful number, since it uses less digits than its factorization.

20120111102005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075079628.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 20120111102005 its reverse (50020111102102), we get a palindrome (70140222204107).

The spelling of 20120111102005 in words is "twenty trillion, one hundred twenty billion, one hundred eleven million, one hundred two thousand, five".