21111120100121 has 16 divisors (see below), whose sum is σ = 21532836528000. Its totient is φ = 20690275502208.

The previous prime is 21111120100097. The next prime is 21111120100127. The reversal of 21111120100121 is 12100102111112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111120100121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111120100096 and 21111120100105.

It is not an unprimeable number, because it can be changed into a prime (21111120100127) 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, 504077060 + ... + 504118938.

It is an arithmetic number, because the mean of its divisors is an integer number (1345802283000).

Almost surely, 2^{21111120100121} is an apocalyptic number.

It is an amenable number.

21111120100121 is a deficient number, since it is larger than the sum of its proper divisors (421716427879).

21111120100121 is a wasteful number, since it uses less digits than its factorization.

21111120100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52048.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111120100121 its reverse (12100102111112), we get a palindrome (33211222211233).

The spelling of 21111120100121 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, one hundred thousand, one hundred twenty-one".