20011020212137 has 2 divisors, whose sum is σ = 20011020212138. Its totient is φ = 20011020212136.

The previous prime is 20011020212041. The next prime is 20011020212143. The reversal of 20011020212137 is 73121202011002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11123532358416 + 8887487853721 = 3335196^2 + 2981189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011020212137 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011020212177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005510106068 + 10005510106069.

It is an arithmetic number, because the mean of its divisors is an integer number (10005510106069).

Almost surely, 2^{20011020212137} is an apocalyptic number.

It is an amenable number.

20011020212137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011020212137 is an equidigital number, since it uses as much as digits as its factorization.

20011020212137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 20011020212137 its reverse (73121202011002), we get a palindrome (93132222223139).

The spelling of 20011020212137 in words is "twenty trillion, eleven billion, twenty million, two hundred twelve thousand, one hundred thirty-seven".