2100111122221 has 16 divisors (see below), whose sum is σ = 2504524437504. Its totient is φ = 1721799923184.

The previous prime is 2100111122167. The next prime is 2100111122237. The reversal of 2100111122221 is 1222211110012.

It is a cyclic number.

It is not a de Polignac number, because 2100111122221 - 2⁷ = 2100111122093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100111122195 and 2100111122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111122621) 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, 16514346 + ... + 16641028.

It is an arithmetic number, because the mean of its divisors is an integer number (156532777344).

Almost surely, 2^{2100111122221} is an apocalyptic number.

It is an amenable number.

2100111122221 is a deficient number, since it is larger than the sum of its proper divisors (404413315283).

2100111122221 is a wasteful number, since it uses less digits than its factorization.

2100111122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229680.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2100111122221 its reverse (1222211110012), we get a palindrome (3322322232233).

The spelling of 2100111122221 in words is "two trillion, one hundred billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".