2101211212111 has 4 divisors (see below), whose sum is σ = 2292230413224. Its totient is φ = 1910192011000.

The previous prime is 2101211212019. The next prime is 2101211212117. The reversal of 2101211212111 is 1112121121012.

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-2101211212111 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 (2101211212117) 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, 95509600540 + ... + 95509600561.

It is an arithmetic number, because the mean of its divisors is an integer number (573057603306).

Almost surely, 2^{2101211212111} is an apocalyptic number.

2101211212111 is a deficient number, since it is larger than the sum of its proper divisors (191019201113).

2101211212111 is a wasteful number, since it uses less digits than its factorization.

2101211212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191019201112.

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

Adding to 2101211212111 its reverse (1112121121012), we get a palindrome (3213332333123).

The spelling of 2101211212111 in words is "two trillion, one hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".