20512105001 has 2 divisors, whose sum is σ = 20512105002. Its totient is φ = 20512105000.

The previous prime is 20512104961. The next prime is 20512105027. The reversal of 20512105001 is 10050121502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19378032025 + 1134072976 = 139205^2 + 33676^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512105001 - 2⁶ = 20512104937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20512105091) 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, 10256052500 + 10256052501.

It is an arithmetic number, because the mean of its divisors is an integer number (10256052501).

Almost surely, 2^20512105001 is an apocalyptic number.

It is an amenable number.

20512105001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512105001 is an equidigital number, since it uses as much as digits as its factorization.

20512105001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

Adding to 20512105001 its reverse (10050121502), we get a palindrome (30562226503).

The spelling of 20512105001 in words is "twenty billion, five hundred twelve million, one hundred five thousand, one".