40321321 has 4 divisors (see below), whose sum is σ = 40720644. Its totient is φ = 39922000.

The previous prime is 40321313. The next prime is 40321373. The reversal of 40321321 is 12312304.

It is a happy number.

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 26925721 + 13395600 = 5189^2 + 3660^2 .

It is a cyclic number.

It is not a de Polignac number, because 40321321 - 2³ = 40321313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40321295 and 40321304.

It is not an unprimeable number, because it can be changed into a prime (40321121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199510 + ... + 199711.

It is an arithmetic number, because the mean of its divisors is an integer number (10180161).

Almost surely, 2^40321321 is an apocalyptic number.

It is an amenable number.

40321321 is a deficient number, since it is larger than the sum of its proper divisors (399323).

40321321 is a wasteful number, since it uses less digits than its factorization.

40321321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399322.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40321321 is about 6349.9071646757. The cubic root of 40321321 is about 342.9085001027.

Adding to 40321321 its reverse (12312304), we get a palindrome (52633625).

The spelling of 40321321 in words is "forty million, three hundred twenty-one thousand, three hundred twenty-one".