21101200012121 has 16 divisors (see below), whose sum is σ = 21429639032640. Its totient is φ = 20773161478080.

The previous prime is 21101200012117. The next prime is 21101200012157. The reversal of 21101200012121 is 12121000210112.

It is not a de Polignac number, because 21101200012121 - 2² = 21101200012117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101200012096 and 21101200012105.

It is not an unprimeable number, because it can be changed into a prime (21101200012621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381232135 + ... + 1381247411.

It is an arithmetic number, because the mean of its divisors is an integer number (1339352439540).

Almost surely, 2^{21101200012121} is an apocalyptic number.

It is an amenable number.

21101200012121 is a deficient number, since it is larger than the sum of its proper divisors (328439020519).

21101200012121 is a wasteful number, since it uses less digits than its factorization.

21101200012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26984.

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

Adding to 21101200012121 its reverse (12121000210112), we get a palindrome (33222200222233).

The spelling of 21101200012121 in words is "twenty-one trillion, one hundred one billion, two hundred million, twelve thousand, one hundred twenty-one".