20020011021121 has 2 divisors, whose sum is σ = 20020011021122. Its totient is φ = 20020011021120.

The previous prime is 20020011021097. The next prime is 20020011021161. The reversal of 20020011021121 is 12112011002002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18994247181121 + 1025763840000 = 4358239^2 + 1012800^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020011021121 - 2⁹ = 20020011020609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020011021161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010005510560 + 10010005510561.

It is an arithmetic number, because the mean of its divisors is an integer number (10010005510561).

Almost surely, 2^{20020011021121} is an apocalyptic number.

It is an amenable number.

20020011021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020011021121 is an equidigital number, since it uses as much as digits as its factorization.

20020011021121 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 13.

Adding to 20020011021121 its reverse (12112011002002), we get a palindrome (32132022023123).

The spelling of 20020011021121 in words is "twenty trillion, twenty billion, eleven million, twenty-one thousand, one hundred twenty-one".