1355242321 has 4 divisors (see below), whose sum is σ = 1384077312. Its totient is φ = 1326407332.

The previous prime is 1355242303. The next prime is 1355242349. The reversal of 1355242321 is 1232425531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1232425531 = 173 ⋅7123847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355242321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1355242321.

It is not an unprimeable number, because it can be changed into a prime (1352242321) 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, 14417425 + ... + 14417518.

It is an arithmetic number, because the mean of its divisors is an integer number (346019328).

Almost surely, 2^1355242321 is an apocalyptic number.

It is an amenable number.

1355242321 is a deficient number, since it is larger than the sum of its proper divisors (28834991).

1355242321 is an equidigital number, since it uses as much as digits as its factorization.

1355242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28834990.

The product of its digits is 7200, while the sum is 28.

The square root of 1355242321 is about 36813.6159728979. The cubic root of 1355242321 is about 1106.6381852136.

Adding to 1355242321 its reverse (1232425531), we get a palindrome (2587667852).

The spelling of 1355242321 in words is "one billion, three hundred fifty-five million, two hundred forty-two thousand, three hundred twenty-one".