20200120121 has 2 divisors, whose sum is σ = 20200120122. Its totient is φ = 20200120120.

The previous prime is 20200120097. The next prime is 20200120133. The reversal of 20200120121 is 12102100202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17413441600 + 2786678521 = 131960^2 + 52789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200120121 is a prime.

It is a super-3 number, since 3×20200120121³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20200123121) 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, 10100060060 + 10100060061.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060061).

Almost surely, 2^20200120121 is an apocalyptic number.

It is an amenable number.

20200120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200120121 is an equidigital number, since it uses as much as digits as its factorization.

20200120121 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 20200120121 its reverse (12102100202), we get a palindrome (32302220323).

The spelling of 20200120121 in words is "twenty billion, two hundred million, one hundred twenty thousand, one hundred twenty-one".