21330120022121 has 4 divisors (see below), whose sum is σ = 21732575116932. Its totient is φ = 20927664927312.

The previous prime is 21330120022111. The next prime is 21330120022151. The reversal of 21330120022121 is 12122002103312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16597150081600 + 4732969940521 = 4073960^2 + 2175539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330120022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330120022093 and 21330120022102.

It is not an unprimeable number, because it can be changed into a prime (21330120022111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201227547326 + ... + 201227547431.

It is an arithmetic number, because the mean of its divisors is an integer number (5433143779233).

Almost surely, 2^{21330120022121} is an apocalyptic number.

It is an amenable number.

21330120022121 is a deficient number, since it is larger than the sum of its proper divisors (402455094811).

21330120022121 is an equidigital number, since it uses as much as digits as its factorization.

21330120022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402455094810.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21330120022121 its reverse (12122002103312), we get a palindrome (33452122125433).

The spelling of 21330120022121 in words is "twenty-one trillion, three hundred thirty billion, one hundred twenty million, twenty-two thousand, one hundred twenty-one".