20012002001 has 2 divisors, whose sum is σ = 20012002002. Its totient is φ = 20012002000.

The previous prime is 20012001991. The next prime is 20012002039. The reversal of 20012002001 is 10020021002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19403097025 + 608904976 = 139295^2 + 24676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012002001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012002001.

It is not a weakly prime, because it can be changed into another prime (20012002061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006001000 + 10006001001.

It is an arithmetic number, because the mean of its divisors is an integer number (10006001001).

Almost surely, 2^20012002001 is an apocalyptic number.

It is an amenable number.

20012002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012002001 is an equidigital number, since it uses as much as digits as its factorization.

20012002001 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 8.

Adding to 20012002001 its reverse (10020021002), we get a palindrome (30032023003).

It can be divided in two parts, 2001 and 2002001, that added together give a palindrome (2004002).

The spelling of 20012002001 in words is "twenty billion, twelve million, two thousand, one".