21110112202221 has 192 divisors, whose sum is σ = 40204382699520. Its totient is φ = 10382647080960.

The previous prime is 21110112202177. The next prime is 21110112202243. The reversal of 21110112202221 is 12220221101112.

21110112202221 is a `hidden beast` number, since 21 + 110 + 112 + 202 + 221 = 666.

It is not a de Polignac number, because 21110112202221 - 2⁷ = 21110112202093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110112202194 and 21110112202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110112202321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 95509566 + ... + 95730336.

It is an arithmetic number, because the mean of its divisors is an integer number (209397826560).

Almost surely, 2^{21110112202221} is an apocalyptic number.

21110112202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21110112202221 is a deficient number, since it is larger than the sum of its proper divisors (19094270497299).

21110112202221 is a wasteful number, since it uses less digits than its factorization.

21110112202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220984 (or 220981 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21110112202221 its reverse (12220221101112), we get a palindrome (33330333303333).

The spelling of 21110112202221 in words is "twenty-one trillion, one hundred ten billion, one hundred twelve million, two hundred two thousand, two hundred twenty-one".