21100111120121 has 8 divisors (see below), whose sum is σ = 23018343422304. Its totient is φ = 19181885548320.

The previous prime is 21100111120097. The next prime is 21100111120181. The reversal of 21100111120121 is 12102111100112.

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

It is not a de Polignac number, because 21100111120121 - 2²⁶ = 21100044011257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21100111120096 and 21100111120105.

It is not an unprimeable number, because it can be changed into a prime (21100111120181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6679325 + ... + 9317381.

It is an arithmetic number, because the mean of its divisors is an integer number (2877292927788).

Almost surely, 2^{21100111120121} is an apocalyptic number.

It is an amenable number.

21100111120121 is a deficient number, since it is larger than the sum of its proper divisors (1918232302183).

21100111120121 is a wasteful number, since it uses less digits than its factorization.

21100111120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365191.

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

Adding to 21100111120121 its reverse (12102111100112), we get a palindrome (33202222220233).

The spelling of 21100111120121 in words is "twenty-one trillion, one hundred billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-one".