40216321 has 2 divisors, whose sum is σ = 40216322. Its totient is φ = 40216320.

The previous prime is 40216289. The next prime is 40216327. The reversal of 40216321 is 12361204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36433296 + 3783025 = 6036^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 40216321 - 2⁵ = 40216289 is a prime.

It is not a weakly prime, because it can be changed into another prime (40216327) 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 as a sum of consecutive naturals, namely, 20108160 + 20108161.

It is an arithmetic number, because the mean of its divisors is an integer number (20108161).

Almost surely, 2^40216321 is an apocalyptic number.

It is an amenable number.

40216321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40216321 is an equidigital number, since it uses as much as digits as its factorization.

40216321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 40216321 is about 6341.6339377167. The cubic root of 40216321 is about 342.6105874800.

Adding to 40216321 its reverse (12361204), we get a palindrome (52577525).

The spelling of 40216321 in words is "forty million, two hundred sixteen thousand, three hundred twenty-one".