21112211102121 has 16 divisors (see below), whose sum is σ = 33117193886400. Its totient is φ = 13246877553984.

The previous prime is 21112211102111. The next prime is 21112211102123. The reversal of 21112211102121 is 12120111221112.

It is a happy number.

21112211102121 is a `hidden beast` number, since 211 + 1 + 221 + 110 + 2 + 121 = 666.

It is not a de Polignac number, because 21112211102121 - 2⁶ = 21112211102057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112211102094 and 21112211102103.

It is not an unprimeable number, because it can be changed into a prime (21112211102123) 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, 22998050851 + ... + 22998051768.

It is an arithmetic number, because the mean of its divisors is an integer number (2069824617900).

Almost surely, 2^{21112211102121} is an apocalyptic number.

It is an amenable number.

21112211102121 is a deficient number, since it is larger than the sum of its proper divisors (12004982784279).

21112211102121 is a wasteful number, since it uses less digits than its factorization.

21112211102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45996102645 (or 45996102639 counting only the distinct ones).

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

Adding to 21112211102121 its reverse (12120111221112), we get a palindrome (33232322323233).

The spelling of 21112211102121 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred two thousand, one hundred twenty-one".