440240221 has 2 divisors, whose sum is σ = 440240222. Its totient is φ = 440240220.

The previous prime is 440240201. The next prime is 440240239. The reversal of 440240221 is 122042044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415588996 + 24651225 = 20386^2 + 4965^2 .

It is a cyclic number.

It is not a de Polignac number, because 440240221 - 2¹⁹ = 439715933 is a prime.

It is a super-2 number, since 2×440240221² = 387622904372257682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440240201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220120110 + 220120111.

It is an arithmetic number, because the mean of its divisors is an integer number (220120111).

Almost surely, 2^440240221 is an apocalyptic number.

It is an amenable number.

440240221 is a deficient number, since it is larger than the sum of its proper divisors (1).

440240221 is an equidigital number, since it uses as much as digits as its factorization.

440240221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 440240221 is about 20981.9022254895. The cubic root of 440240221 is about 760.7288834918.

Adding to 440240221 its reverse (122042044), we get a palindrome (562282265).

The spelling of 440240221 in words is "four hundred forty million, two hundred forty thousand, two hundred twenty-one".