40533221 has 4 divisors (see below), whose sum is σ = 40586700. Its totient is φ = 40479744.

The previous prime is 40533217. The next prime is 40533263. The reversal of 40533221 is 12233504.

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 7344100 + 33189121 = 2710^2 + 5761^2 .

It is a cyclic number.

It is not a de Polignac number, because 40533221 - 2² = 40533217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40533193 and 40533202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40533211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25586 + ... + 27123.

It is an arithmetic number, because the mean of its divisors is an integer number (10146675).

Almost surely, 2^40533221 is an apocalyptic number.

It is an amenable number.

40533221 is a deficient number, since it is larger than the sum of its proper divisors (53479).

40533221 is an equidigital number, since it uses as much as digits as its factorization.

40533221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53478.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 40533221 is about 6366.5705839172. The cubic root of 40533221 is about 343.5081447627.

Adding to 40533221 its reverse (12233504), we get a palindrome (52766725).

The spelling of 40533221 in words is "forty million, five hundred thirty-three thousand, two hundred twenty-one".