1243341221 has 2 divisors, whose sum is σ = 1243341222. Its totient is φ = 1243341220.

The previous prime is 1243341217. The next prime is 1243341227. The reversal of 1243341221 is 1221433421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038450625 + 204890596 = 32225^2 + 14314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243341221 - 2² = 1243341217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243341227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621670610 + 621670611.

It is an arithmetic number, because the mean of its divisors is an integer number (621670611).

Almost surely, 2^1243341221 is an apocalyptic number.

It is an amenable number.

1243341221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243341221 is an equidigital number, since it uses as much as digits as its factorization.

1243341221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 1243341221 is about 35261.0439578864. The cubic root of 1243341221 is about 1075.3011511782.

Adding to 1243341221 its reverse (1221433421), we get a palindrome (2464774642).

The spelling of 1243341221 in words is "one billion, two hundred forty-three million, three hundred forty-one thousand, two hundred twenty-one".