2000020001261 has 2 divisors, whose sum is σ = 2000020001262. Its totient is φ = 2000020001260.

The previous prime is 2000020001227. The next prime is 2000020001297. The reversal of 2000020001261 is 1621000200002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1882246802500 + 117773198761 = 1371950^2 + 343181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2000020001261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000020000261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000010000630 + 1000010000631.

It is an arithmetic number, because the mean of its divisors is an integer number (1000010000631).

Almost surely, 2^{2000020001261} is an apocalyptic number.

It is an amenable number.

2000020001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000020001261 is an equidigital number, since it uses as much as digits as its factorization.

2000020001261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 2000020001261 its reverse (1621000200002), we get a palindrome (3621020201263).

The spelling of 2000020001261 in words is "two trillion, twenty million, one thousand, two hundred sixty-one".