21110121020011 has 8 divisors (see below), whose sum is σ = 21602840253104. Its totient is φ = 20617482977280.

The previous prime is 21110121019993. The next prime is 21110121020057. The reversal of 21110121020011 is 11002012101112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110121020011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110121019973 and 21110121020000.

It is not an unprimeable number, because it can be changed into a prime (21110121020411) 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, 19771350 + ... + 20811691.

It is an arithmetic number, because the mean of its divisors is an integer number (2700355031638).

Almost surely, 2^{21110121020011} is an apocalyptic number.

21110121020011 is a deficient number, since it is larger than the sum of its proper divisors (492719233093).

21110121020011 is a wasteful number, since it uses less digits than its factorization.

21110121020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40595181.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110121020011 its reverse (11002012101112), we get a palindrome (32112133121123).

The spelling of 21110121020011 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, twenty thousand, eleven".