21120120001121 has 16 divisors (see below), whose sum is σ = 21785914897920. Its totient is φ = 20463397012800.

The previous prime is 21120120001111. The next prime is 21120120001129. The reversal of 21120120001121 is 12110002102112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120120001121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120120001096 and 21120120001105.

It is not an unprimeable number, because it can be changed into a prime (21120120001129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36200795 + ... + 36779583.

It is an arithmetic number, because the mean of its divisors is an integer number (1361619681120).

Almost surely, 2^{21120120001121} is an apocalyptic number.

It is an amenable number.

21120120001121 is a deficient number, since it is larger than the sum of its proper divisors (665794896799).

21120120001121 is a wasteful number, since it uses less digits than its factorization.

21120120001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586624.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21120120001121 its reverse (12110002102112), we get a palindrome (33230122103233).

The spelling of 21120120001121 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty million, one thousand, one hundred twenty-one".