1343221421 has 2 divisors, whose sum is σ = 1343221422. Its totient is φ = 1343221420.

The previous prime is 1343221393. The next prime is 1343221447. The reversal of 1343221421 is 1241223431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340365321 + 2856100 = 36611^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343221421 - 2¹⁰ = 1343220397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1303221421) 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, 671610710 + 671610711.

It is an arithmetic number, because the mean of its divisors is an integer number (671610711).

Almost surely, 2^1343221421 is an apocalyptic number.

It is an amenable number.

1343221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1343221421 is an equidigital number, since it uses as much as digits as its factorization.

1343221421 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 1343221421 is about 36649.9852796696. The cubic root of 1343221421 is about 1103.3565301411.

Adding to 1343221421 its reverse (1241223431), we get a palindrome (2584444852).

The spelling of 1343221421 in words is "one billion, three hundred forty-three million, two hundred twenty-one thousand, four hundred twenty-one".