2001013233281 has 2 divisors, whose sum is σ = 2001013233282. Its totient is φ = 2001013233280.

The previous prime is 2001013233203. The next prime is 2001013233301. The reversal of 2001013233281 is 1823323101002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1728675373681 + 272337859600 = 1314791^2 + 521860^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001013233281 - 2³⁸ = 1726135326337 is a prime.

It is a super-2 number, since 2×2001013233281² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001013233281.

It is not a weakly prime, because it can be changed into another prime (2001013203281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000506616640 + 1000506616641.

It is an arithmetic number, because the mean of its divisors is an integer number (1000506616641).

Almost surely, 2^{2001013233281} is an apocalyptic number.

It is an amenable number.

2001013233281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001013233281 is an equidigital number, since it uses as much as digits as its factorization.

2001013233281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 2001013233281 its reverse (1823323101002), we get a palindrome (3824336334283).

The spelling of 2001013233281 in words is "two trillion, one billion, thirteen million, two hundred thirty-three thousand, two hundred eighty-one".