20012020121 has 2 divisors, whose sum is σ = 20012020122. Its totient is φ = 20012020120.

The previous prime is 20012020109. The next prime is 20012020213. The reversal of 20012020121 is 12102021002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17599736896 + 2412283225 = 132664^2 + 49115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012020121 - 2⁶ = 20012020057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012020421) 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, 10006010060 + 10006010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10006010061).

Almost surely, 2^20012020121 is an apocalyptic number.

It is an amenable number.

20012020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012020121 is an equidigital number, since it uses as much as digits as its factorization.

20012020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012020121 its reverse (12102021002), we get a palindrome (32114041123).

The spelling of 20012020121 in words is "twenty billion, twelve million, twenty thousand, one hundred twenty-one".