1205341321 has 4 divisors (see below), whose sum is σ = 1206140544. Its totient is φ = 1204542100.

The previous prime is 1205341309. The next prime is 1205341331. The reversal of 1205341321 is 1231435021.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1205341321 - 2⁹ = 1205340809 is a prime.

It is a super-2 number, since 2×1205341321² = 2905695400220050082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205341292 and 1205341301.

It is not an unprimeable number, because it can be changed into a prime (1205341301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397345 + ... + 400366.

It is an arithmetic number, because the mean of its divisors is an integer number (301535136).

Almost surely, 2^1205341321 is an apocalyptic number.

It is an amenable number.

1205341321 is a deficient number, since it is larger than the sum of its proper divisors (799223).

1205341321 is an equidigital number, since it uses as much as digits as its factorization.

1205341321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799222.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1205341321 is about 34718.0258799374. The cubic root of 1205341321 is about 1064.2329024635.

Adding to 1205341321 its reverse (1231435021), we get a palindrome (2436776342).

The spelling of 1205341321 in words is "one billion, two hundred five million, three hundred forty-one thousand, three hundred twenty-one".