2100120001111 has 4 divisors (see below), whose sum is σ = 2291040001224. Its totient is φ = 1909200001000.

The previous prime is 2100120001051. The next prime is 2100120001127. The reversal of 2100120001111 is 1111000210012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100120001111 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 (2100120008111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95460000040 + ... + 95460000061.

It is an arithmetic number, because the mean of its divisors is an integer number (572760000306).

Almost surely, 2^{2100120001111} is an apocalyptic number.

2100120001111 is a deficient number, since it is larger than the sum of its proper divisors (190920000113).

2100120001111 is a wasteful number, since it uses less digits than its factorization.

2100120001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190920000112.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 2100120001111 its reverse (1111000210012), we get a palindrome (3211120211123).

The spelling of 2100120001111 in words is "two trillion, one hundred billion, one hundred twenty million, one thousand, one hundred eleven".