2100121111105 has 16 divisors (see below), whose sum is σ = 2521422869184. Its totient is φ = 1679245444800.

The previous prime is 2100121111103. The next prime is 2100121111139. The reversal of 2100121111105 is 5011111210012.

It is not a de Polignac number, because 2100121111105 - 2¹ = 2100121111103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100121111103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95436034 + ... + 95458036.

It is an arithmetic number, because the mean of its divisors is an integer number (157588929324).

Almost surely, 2^{2100121111105} is an apocalyptic number.

It is an amenable number.

2100121111105 is a deficient number, since it is larger than the sum of its proper divisors (421301758079).

2100121111105 is a wasteful number, since it uses less digits than its factorization.

2100121111105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30816.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 2100121111105 its reverse (5011111210012), we get a palindrome (7111232321117).

The spelling of 2100121111105 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred eleven thousand, one hundred five".