2001404342321 has 4 divisors (see below), whose sum is σ = 2001560070132. Its totient is φ = 2001248614512.

The previous prime is 2001404342317. The next prime is 2001404342341. The reversal of 2001404342321 is 1232434041002.

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 194799532321 + 1806604810000 = 441361^2 + 1344100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001404342321 - 2² = 2001404342317 is a prime.

It is a super-2 number, since 2×2001404342321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001404342341) 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, 77844626 + ... + 77870331.

It is an arithmetic number, because the mean of its divisors is an integer number (500390017533).

Almost surely, 2^{2001404342321} is an apocalyptic number.

It is an amenable number.

2001404342321 is a deficient number, since it is larger than the sum of its proper divisors (155727811).

2001404342321 is a wasteful number, since it uses less digits than its factorization.

2001404342321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155727810.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 2001404342321 its reverse (1232434041002), we get a palindrome (3233838383323).

The spelling of 2001404342321 in words is "two trillion, one billion, four hundred four million, three hundred forty-two thousand, three hundred twenty-one".