2001023331121 has 4 divisors (see below), whose sum is σ = 2009761424500. Its totient is φ = 1992285237744.

The previous prime is 2001023331119. The next prime is 2001023331133. The reversal of 2001023331121 is 1211333201002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1553949230625 + 447074100496 = 1246575^2 + 668636^2 .

It is not a de Polignac number, because 2001023331121 - 2¹ = 2001023331119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001023331421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4369046346 + ... + 4369046803.

It is an arithmetic number, because the mean of its divisors is an integer number (502440356125).

Almost surely, 2^{2001023331121} is an apocalyptic number.

It is an amenable number.

2001023331121 is a deficient number, since it is larger than the sum of its proper divisors (8738093379).

2001023331121 is an equidigital number, since it uses as much as digits as its factorization.

2001023331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738093378.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 2001023331121 its reverse (1211333201002), we get a palindrome (3212356532123).

The spelling of 2001023331121 in words is "two trillion, one billion, twenty-three million, three hundred thirty-one thousand, one hundred twenty-one".