40242221 has 2 divisors, whose sum is σ = 40242222. Its totient is φ = 40242220.

The previous prime is 40242217. The next prime is 40242233. The reversal of 40242221 is 12224204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25110121 + 15132100 = 5011^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 40242221 - 2² = 40242217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40242221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40242721) 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, 20121110 + 20121111.

It is an arithmetic number, because the mean of its divisors is an integer number (20121111).

Almost surely, 2^40242221 is an apocalyptic number.

It is an amenable number.

40242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40242221 is an equidigital number, since it uses as much as digits as its factorization.

40242221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 40242221 is about 6343.6756695153. The cubic root of 40242221 is about 342.6841207269.

Adding to 40242221 its reverse (12224204), we get a palindrome (52466425).

The spelling of 40242221 in words is "forty million, two hundred forty-two thousand, two hundred twenty-one".