40521221 has 8 divisors (see below), whose sum is σ = 44047584. Its totient is φ = 37053360.

The previous prime is 40521211. The next prime is 40521227. The reversal of 40521221 is 12212504.

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 40521221 - 2⁶ = 40521157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40521221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521227) 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 7 ways as a sum of consecutive naturals, for example, 13175 + ... + 15956.

It is an arithmetic number, because the mean of its divisors is an integer number (5505948).

Almost surely, 2^40521221 is an apocalyptic number.

It is an amenable number.

40521221 is a deficient number, since it is larger than the sum of its proper divisors (3526363).

40521221 is a wasteful number, since it uses less digits than its factorization.

40521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29251.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 40521221 is about 6365.6280915555. The cubic root of 40521221 is about 343.4742424929.

Adding to 40521221 its reverse (12212504), we get a palindrome (52733725).

The spelling of 40521221 in words is "forty million, five hundred twenty-one thousand, two hundred twenty-one".