21110220110121 has 8 divisors (see below), whose sum is σ = 28151339659104. Its totient is φ = 14071290317280.

The previous prime is 21110220110093. The next prime is 21110220110159. The reversal of 21110220110121 is 12101102201112.

It is a happy number.

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

It is not a de Polignac number, because 21110220110121 - 2¹⁴ = 21110220093737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110220110121.

It is not an unprimeable number, because it can be changed into a prime (21110220110321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547416540 + ... + 547455101.

It is an arithmetic number, because the mean of its divisors is an integer number (3518917457388).

Almost surely, 2^{21110220110121} is an apocalyptic number.

It is an amenable number.

21110220110121 is a deficient number, since it is larger than the sum of its proper divisors (7041119548983).

21110220110121 is a wasteful number, since it uses less digits than its factorization.

21110220110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094878071.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110220110121 its reverse (12101102201112), we get a palindrome (33211322311233).

The spelling of 21110220110121 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty million, one hundred ten thousand, one hundred twenty-one".