2111202121111 has 4 divisors (see below), whose sum is σ = 2116011238000. Its totient is φ = 2106393004224.

The previous prime is 2111202121069. The next prime is 2111202121117. The reversal of 2111202121111 is 1111212021112.

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

It is a cyclic number.

It is not a de Polignac number, because 2111202121111 - 2⁷ = 2111202120983 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 (2111202121117) 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, 2404557786 + ... + 2404558663.

It is an arithmetic number, because the mean of its divisors is an integer number (529002809500).

Almost surely, 2^{2111202121111} is an apocalyptic number.

2111202121111 is a deficient number, since it is larger than the sum of its proper divisors (4809116889).

2111202121111 is an equidigital number, since it uses as much as digits as its factorization.

2111202121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809116888.

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

Adding to 2111202121111 its reverse (1111212021112), we get a palindrome (3222414142223).

Subtracting from 2111202121111 its reverse (1111212021112), we obtain a palindrome (999990099999).

The spelling of 2111202121111 in words is "two trillion, one hundred eleven billion, two hundred two million, one hundred twenty-one thousand, one hundred eleven".