21112112201121 has 32 divisors (see below), whose sum is σ = 33726380956800. Its totient is φ = 13008746914560.

The previous prime is 21112112201111. The next prime is 21112112201129. The reversal of 21112112201121 is 12110221121112.

It is a happy number.

21112112201121 is a `hidden beast` number, since 2 + 111 + 211 + 220 + 1 + 121 = 666.

It is not a de Polignac number, because 21112112201121 - 2⁶ = 21112112201057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112112201094 and 21112112201103.

It is not an unprimeable number, because it can be changed into a prime (21112112201129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 501859636 + ... + 501901701.

It is an arithmetic number, because the mean of its divisors is an integer number (1053949404900).

Almost surely, 2^{21112112201121} is an apocalyptic number.

It is an amenable number.

21112112201121 is a deficient number, since it is larger than the sum of its proper divisors (12614268755679).

21112112201121 is a wasteful number, since it uses less digits than its factorization.

21112112201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003761406 (or 1003761400 counting only the distinct ones).

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

Adding to 21112112201121 its reverse (12110221121112), we get a palindrome (33222333322233).

The spelling of 21112112201121 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, two hundred one thousand, one hundred twenty-one".