21102112222111 has 8 divisors (see below), whose sum is σ = 21111805917504. Its totient is φ = 21092420697120.

The previous prime is 21102112222039. The next prime is 21102112222117. The reversal of 21102112222111 is 11122221120112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21102112222111 - 2²⁷ = 21101978004383 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 (21102112222117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19069641 + ... + 20145853.

It is an arithmetic number, because the mean of its divisors is an integer number (2638975739688).

Almost surely, 2^{21102112222111} is an apocalyptic number.

21102112222111 is a deficient number, since it is larger than the sum of its proper divisors (9693695393).

21102112222111 is a wasteful number, since it uses less digits than its factorization.

21102112222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085201.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21102112222111 its reverse (11122221120112), we get a palindrome (32224333342223).

The spelling of 21102112222111 in words is "twenty-one trillion, one hundred two billion, one hundred twelve million, two hundred twenty-two thousand, one hundred eleven".