2001333222181 has 2 divisors, whose sum is σ = 2001333222182. Its totient is φ = 2001333222180.

The previous prime is 2001333222149. The next prime is 2001333222227. The reversal of 2001333222181 is 1812223331002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947783096900 + 53550125281 = 1395630^2 + 231409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001333222181 - 2⁵ = 2001333222149 is a prime.

It is a super-2 number, since 2×2001333222181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001333232181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000666611090 + 1000666611091.

It is an arithmetic number, because the mean of its divisors is an integer number (1000666611091).

Almost surely, 2^{2001333222181} is an apocalyptic number.

It is an amenable number.

2001333222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001333222181 is an equidigital number, since it uses as much as digits as its factorization.

2001333222181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 2001333222181 its reverse (1812223331002), we get a palindrome (3813556553183).

The spelling of 2001333222181 in words is "two trillion, one billion, three hundred thirty-three million, two hundred twenty-two thousand, one hundred eighty-one".