2001001122161 has 2 divisors, whose sum is σ = 2001001122162. Its totient is φ = 2001001122160.

The previous prime is 2001001122157. The next prime is 2001001122223. The reversal of 2001001122161 is 1612211001002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1986859393600 + 14141728561 = 1409560^2 + 118919^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001001122161 - 2² = 2001001122157 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001001122061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000500561080 + 1000500561081.

It is an arithmetic number, because the mean of its divisors is an integer number (1000500561081).

Almost surely, 2^{2001001122161} is an apocalyptic number.

It is an amenable number.

2001001122161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001001122161 is an equidigital number, since it uses as much as digits as its factorization.

2001001122161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2001001122161 its reverse (1612211001002), we get a palindrome (3613212123163).

The spelling of 2001001122161 in words is "two trillion, one billion, one million, one hundred twenty-two thousand, one hundred sixty-one".