1343220321 has 4 divisors (see below), whose sum is σ = 1790960432. Its totient is φ = 895480212.

The previous prime is 1343220317. The next prime is 1343220323. The reversal of 1343220321 is 1230223431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1343220321 - 2² = 1343220317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1343220323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223870051 + ... + 223870056.

It is an arithmetic number, because the mean of its divisors is an integer number (447740108).

Almost surely, 2^1343220321 is an apocalyptic number.

It is an amenable number.

1343220321 is a deficient number, since it is larger than the sum of its proper divisors (447740111).

1343220321 is an equidigital number, since it uses as much as digits as its factorization.

1343220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447740110.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1343220321 is about 36649.9702728392. The cubic root of 1343220321 is about 1103.3562289516.

Adding to 1343220321 its reverse (1230223431), we get a palindrome (2573443752).

The spelling of 1343220321 in words is "one billion, three hundred forty-three million, two hundred twenty thousand, three hundred twenty-one".