20011020100121 has 2 divisors, whose sum is σ = 20011020100122. Its totient is φ = 20011020100120.

The previous prime is 20011020100087. The next prime is 20011020100129. The reversal of 20011020100121 is 12100102011002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18870865971721 + 1140154128400 = 4344061^2 + 1067780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011020100121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011020100129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005510050060 + 10005510050061.

It is an arithmetic number, because the mean of its divisors is an integer number (10005510050061).

Almost surely, 2^{20011020100121} is an apocalyptic number.

It is an amenable number.

20011020100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011020100121 is an equidigital number, since it uses as much as digits as its factorization.

20011020100121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011020100121 its reverse (12100102011002), we get a palindrome (32111122111123).

The spelling of 20011020100121 in words is "twenty trillion, eleven billion, twenty million, one hundred thousand, one hundred twenty-one".