40331221 has 8 divisors (see below), whose sum is σ = 47338880. Its totient is φ = 33635088.

The previous prime is 40331209. The next prime is 40331227. The reversal of 40331221 is 12213304.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40331221 - 2⁹ = 40330709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40331195 and 40331204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40331227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77601 + ... + 78118.

It is an arithmetic number, because the mean of its divisors is an integer number (5917360).

Almost surely, 2^40331221 is an apocalyptic number.

It is an amenable number.

40331221 is a deficient number, since it is larger than the sum of its proper divisors (7007659).

40331221 is a wasteful number, since it uses less digits than its factorization.

40331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155763.

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

The square root of 40331221 is about 6350.6866557877. The cubic root of 40331221 is about 342.9365623145.

Adding to 40331221 its reverse (12213304), we get a palindrome (52544525).

The spelling of 40331221 in words is "forty million, three hundred thirty-one thousand, two hundred twenty-one".