21120013020121 has 8 divisors (see below), whose sum is σ = 21191813136000. Its totient is φ = 21048237841440.

The previous prime is 21120013020089. The next prime is 21120013020143. The reversal of 21120013020121 is 12102031002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120013020121 - 2⁵ = 21120013020089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120013020095 and 21120013020104.

It is not an unprimeable number, because it can be changed into a prime (21120013020151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536781 + ... + 7926058.

It is an arithmetic number, because the mean of its divisors is an integer number (2648976642000).

Almost surely, 2^{21120013020121} is an apocalyptic number.

It is an amenable number.

21120013020121 is a deficient number, since it is larger than the sum of its proper divisors (71800115879).

21120013020121 is a wasteful number, since it uses less digits than its factorization.

21120013020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12468599.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120013020121 its reverse (12102031002112), we get a palindrome (33222044022233).

The spelling of 21120013020121 in words is "twenty-one trillion, one hundred twenty billion, thirteen million, twenty thousand, one hundred twenty-one".