1340444221 has 2 divisors, whose sum is σ = 1340444222. Its totient is φ = 1340444220.

The previous prime is 1340444207. The next prime is 1340444227. The reversal of 1340444221 is 1224440431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 983763225 + 356680996 = 31365^2 + 18886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340444221 - 2⁷ = 1340444093 is a prime.

It is a super-2 number, since 2×1340444221² = 3593581419224593682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340444227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670222110 + 670222111.

It is an arithmetic number, because the mean of its divisors is an integer number (670222111).

Almost surely, 2^1340444221 is an apocalyptic number.

It is an amenable number.

1340444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340444221 is an equidigital number, since it uses as much as digits as its factorization.

1340444221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1340444221 is about 36612.0775291433. The cubic root of 1340444221 is about 1102.5955843585.

Adding to 1340444221 its reverse (1224440431), we get a palindrome (2564884652).

The spelling of 1340444221 in words is "one billion, three hundred forty million, four hundred forty-four thousand, two hundred twenty-one".