2001122122189 has 2 divisors, whose sum is σ = 2001122122190. Its totient is φ = 2001122122188.

The previous prime is 2001122122159. The next prime is 2001122122193. The reversal of 2001122122189 is 9812212211002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2000385922500 + 736199689 = 1414350^2 + 27133^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001122122189 - 2⁷ = 2001122122061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001122122189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001122122159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000561061094 + 1000561061095.

It is an arithmetic number, because the mean of its divisors is an integer number (1000561061095).

Almost surely, 2^{2001122122189} is an apocalyptic number.

It is an amenable number.

2001122122189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001122122189 is an equidigital number, since it uses as much as digits as its factorization.

2001122122189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 2001122122189 in words is "two trillion, one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred eighty-nine".