2001405321 has 16 divisors (see below), whose sum is σ = 2982806400. Its totient is φ = 1326277584.

The previous prime is 2001405317. The next prime is 2001405323. The reversal of 2001405321 is 1235041002.

2001405321 is a `hidden beast` number, since 200 + 140 + 5 + 321 = 666.

It is not a de Polignac number, because 2001405321 - 2² = 2001405317 is a prime.

It is a super-2 number, since 2×2001405321² = 8011246517854226082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001405294 and 2001405303.

It is not an unprimeable number, because it can be changed into a prime (2001405323) 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, 217426 + ... + 226443.

It is an arithmetic number, because the mean of its divisors is an integer number (186425400).

Almost surely, 2^2001405321 is an apocalyptic number.

It is an amenable number.

2001405321 is a deficient number, since it is larger than the sum of its proper divisors (981401079).

2001405321 is a wasteful number, since it uses less digits than its factorization.

2001405321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444045 (or 444039 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2001405321 is about 44737.0687573515. The cubic root of 2001405321 is about 1260.2160797220.

Adding to 2001405321 its reverse (1235041002), we get a palindrome (3236446323).

The spelling of 2001405321 in words is "two billion, one million, four hundred five thousand, three hundred twenty-one".