20420110121 has 4 divisors (see below), whose sum is σ = 20724887952. Its totient is φ = 20115332292.

The previous prime is 20420110097. The next prime is 20420110127. The reversal of 20420110121 is 12101102402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20420110121 - 2³⁰ = 19346368297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20420110096 and 20420110105.

It is not an unprimeable number, because it can be changed into a prime (20420110127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152388815 + ... + 152388948.

It is an arithmetic number, because the mean of its divisors is an integer number (5181221988).

Almost surely, 2^20420110121 is an apocalyptic number.

It is an amenable number.

20420110121 is a deficient number, since it is larger than the sum of its proper divisors (304777831).

20420110121 is an equidigital number, since it uses as much as digits as its factorization.

20420110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304777830.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20420110121 its reverse (12101102402), we get a palindrome (32521212523).

The spelling of 20420110121 in words is "twenty billion, four hundred twenty million, one hundred ten thousand, one hundred twenty-one".