20110121001011 has 2 divisors, whose sum is σ = 20110121001012. Its totient is φ = 20110121001010.

The previous prime is 20110121000947. The next prime is 20110121001067. The reversal of 20110121001011 is 11010012101102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20110121001011 - 2⁶ = 20110121000947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110121000983 and 20110121001001.

It is not a weakly prime, because it can be changed into another prime (20110121001811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055060500505 + 10055060500506.

It is an arithmetic number, because the mean of its divisors is an integer number (10055060500506).

Almost surely, 2^{20110121001011} is an apocalyptic number.

20110121001011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110121001011 is an equidigital number, since it uses as much as digits as its factorization.

20110121001011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20110121001011 its reverse (11010012101102), we get a palindrome (31120133102113).

The spelling of 20110121001011 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, one thousand, eleven".