21110020121011 has 4 divisors (see below), whose sum is σ = 21307310028792. Its totient is φ = 20912730213232.

The previous prime is 21110020120997. The next prime is 21110020121087. The reversal of 21110020121011 is 11012102001112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110020121011 - 2¹⁵ = 21110020088243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110020120982 and 21110020121000.

It is not an unprimeable number, because it can be changed into a prime (21110020121111) 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 3 ways as a sum of consecutive naturals, for example, 98644953730 + ... + 98644953943.

It is an arithmetic number, because the mean of its divisors is an integer number (5326827507198).

Almost surely, 2^{21110020121011} is an apocalyptic number.

21110020121011 is a deficient number, since it is larger than the sum of its proper divisors (197289907781).

21110020121011 is a wasteful number, since it uses less digits than its factorization.

21110020121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197289907780.

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

Adding to 21110020121011 its reverse (11012102001112), we get a palindrome (32122122122123).

The spelling of 21110020121011 in words is "twenty-one trillion, one hundred ten billion, twenty million, one hundred twenty-one thousand, eleven".