20110121211011 has 4 divisors (see below), whose sum is σ = 21657053611872. Its totient is φ = 18563188810152.

The previous prime is 20110121210987. The next prime is 20110121211031. The reversal of 20110121211011 is 11011212101102.

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 20110121211011 - 2³⁰ = 20109047469187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110121211031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773466200411 + ... + 773466200436.

It is an arithmetic number, because the mean of its divisors is an integer number (5414263402968).

Almost surely, 2^{20110121211011} is an apocalyptic number.

20110121211011 is a deficient number, since it is larger than the sum of its proper divisors (1546932400861).

20110121211011 is a wasteful number, since it uses less digits than its factorization.

20110121211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546932400860.

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

Adding to 20110121211011 its reverse (11011212101102), we get a palindrome (31121333312113).

The spelling of 20110121211011 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, eleven".