20101110121 has 2 divisors, whose sum is σ = 20101110122. Its totient is φ = 20101110120.

The previous prime is 20101110109. The next prime is 20101110151. The reversal of 20101110121 is 12101110102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14349404521 + 5751705600 = 119789^2 + 75840^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101110121 - 2⁵ = 20101110089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20101110098 and 20101110107.

It is not a weakly prime, because it can be changed into another prime (20101110101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050555060 + 10050555061.

It is an arithmetic number, because the mean of its divisors is an integer number (10050555061).

Almost surely, 2^20101110121 is an apocalyptic number.

It is an amenable number.

20101110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101110121 is an equidigital number, since it uses as much as digits as its factorization.

20101110121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20101110121 its reverse (12101110102), we get a palindrome (32202220223).

The spelling of 20101110121 in words is "twenty billion, one hundred one million, one hundred ten thousand, one hundred twenty-one".