1440255221 has 2 divisors, whose sum is σ = 1440255222. Its totient is φ = 1440255220.

The previous prime is 1440255211. The next prime is 1440255247. The reversal of 1440255221 is 1225520441.

It is an a-pointer prime, because the next prime (1440255247) can be obtained adding 1440255221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435348996 + 4906225 = 37886^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440255221 - 2¹⁴ = 1440238837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440255211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720127610 + 720127611.

It is an arithmetic number, because the mean of its divisors is an integer number (720127611).

Almost surely, 2^1440255221 is an apocalyptic number.

It is an amenable number.

1440255221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440255221 is an equidigital number, since it uses as much as digits as its factorization.

1440255221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 1440255221 is about 37950.6946049740. The cubic root of 1440255221 is about 1129.3099452041.

Adding to 1440255221 its reverse (1225520441), we get a palindrome (2665775662).

The spelling of 1440255221 in words is "one billion, four hundred forty million, two hundred fifty-five thousand, two hundred twenty-one".