2001133122121 has 16 divisors (see below), whose sum is σ = 2340497998080. Its totient is φ = 1675583703360.

The previous prime is 2001133122103. The next prime is 2001133122133. The reversal of 2001133122121 is 1212213311002.

It is not a de Polignac number, because 2001133122121 - 2⁹ = 2001133121609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001133122421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18415666 + ... + 18524011.

It is an arithmetic number, because the mean of its divisors is an integer number (146281124880).

Almost surely, 2^{2001133122121} is an apocalyptic number.

It is an amenable number.

2001133122121 is a deficient number, since it is larger than the sum of its proper divisors (339364875959).

2001133122121 is a wasteful number, since it uses less digits than its factorization.

2001133122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36939864.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2001133122121 its reverse (1212213311002), we get a palindrome (3213346433123).

The spelling of 2001133122121 in words is "two trillion, one billion, one hundred thirty-three million, one hundred twenty-two thousand, one hundred twenty-one".