21102112211121 has 24 divisors (see below), whose sum is σ = 31660979916384. Its totient is φ = 14045273938080.

The previous prime is 21102112211113. The next prime is 21102112211137. The reversal of 21102112211121 is 12111221120112.

It is a happy number.

21102112211121 is a `hidden beast` number, since 2 + 110 + 211 + 221 + 1 + 121 = 666.

It is not a de Polignac number, because 21102112211121 - 2³ = 21102112211113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102112211094 and 21102112211103.

It is not an unprimeable number, because it can be changed into a prime (21102112211821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70222815 + ... + 70522676.

It is an arithmetic number, because the mean of its divisors is an integer number (1319207496516).

Almost surely, 2^{21102112211121} is an apocalyptic number.

It is an amenable number.

21102112211121 is a deficient number, since it is larger than the sum of its proper divisors (10558867705263).

21102112211121 is an equidigital number, since it uses as much as digits as its factorization.

21102112211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140746123 (or 140746111 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21102112211121 its reverse (12111221120112), we get a palindrome (33213333331233).

The spelling of 21102112211121 in words is "twenty-one trillion, one hundred two billion, one hundred twelve million, two hundred eleven thousand, one hundred twenty-one".