21111020121110 has 8 divisors (see below), whose sum is σ = 37999836218016. Its totient is φ = 8444408048440.

The previous prime is 21111020121089. The next prime is 21111020121143. The reversal of 21111020121110 is 1112102011112.

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

It is a super-2 number, since 2×21111020121110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1055551006046 + ... + 1055551006065.

It is an arithmetic number, because the mean of its divisors is an integer number (4749979527252).

Almost surely, 2^{21111020121110} is an apocalyptic number.

21111020121110 is a deficient number, since it is larger than the sum of its proper divisors (16888816096906).

21111020121110 is a wasteful number, since it uses less digits than its factorization.

21111020121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111102012118.

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

Adding to 21111020121110 its reverse (1112102011112), we get a palindrome (22223122132222).

The spelling of 21111020121110 in words is "twenty-one trillion, one hundred eleven billion, twenty million, one hundred twenty-one thousand, one hundred ten".