2001121139 has 2 divisors, whose sum is σ = 2001121140. Its totient is φ = 2001121138.

The previous prime is 2001121117. The next prime is 2001121189. The reversal of 2001121139 is 9311211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001121139 - 2¹⁶ = 2001055603 is a prime.

It is a super-3 number, since 3×2001121139³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001121139.

It is not a weakly prime, because it can be changed into another prime (2001121189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000560569 + 1000560570.

It is an arithmetic number, because the mean of its divisors is an integer number (1000560570).

Almost surely, 2^2001121139 is an apocalyptic number.

2001121139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001121139 is an equidigital number, since it uses as much as digits as its factorization.

2001121139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 2001121139 is about 44733.8925089244. The cubic root of 2001121139 is about 1260.1564303556.

The spelling of 2001121139 in words is "two billion, one million, one hundred twenty-one thousand, one hundred thirty-nine".