1343123321 has 4 divisors (see below), whose sum is σ = 1343201700. Its totient is φ = 1343044944.

The previous prime is 1343123303. The next prime is 1343123323. The reversal of 1343123321 is 1233213431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1233213431 = 6361 ⋅193871.

It can be written as a sum of positive squares in 2 ways, for example, as 1143183721 + 199939600 = 33811^2 + 14140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343123321 - 2¹⁴ = 1343106937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1343123323) 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, 1226 + ... + 51843.

It is an arithmetic number, because the mean of its divisors is an integer number (335800425).

Almost surely, 2^1343123321 is an apocalyptic number.

It is an amenable number.

1343123321 is a deficient number, since it is larger than the sum of its proper divisors (78379).

1343123321 is an equidigital number, since it uses as much as digits as its factorization.

1343123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78378.

The product of its digits is 1296, while the sum is 23.

The square root of 1343123321 is about 36648.6469190883. The cubic root of 1343123321 is about 1103.3296688684.

Adding to 1343123321 its reverse (1233213431), we get a palindrome (2576336752).

The spelling of 1343123321 in words is "one billion, three hundred forty-three million, one hundred twenty-three thousand, three hundred twenty-one".