1205315321 has 4 divisors (see below), whose sum is σ = 1377503232. Its totient is φ = 1033127412.

The previous prime is 1205315297. The next prime is 1205315359. The reversal of 1205315321 is 1235135021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1235135021 = 6701 ⋅184321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205315321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205315821) 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, 86093945 + ... + 86093958.

It is an arithmetic number, because the mean of its divisors is an integer number (344375808).

Almost surely, 2^1205315321 is an apocalyptic number.

It is an amenable number.

1205315321 is a deficient number, since it is larger than the sum of its proper divisors (172187911).

1205315321 is an equidigital number, since it uses as much as digits as its factorization.

1205315321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172187910.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1205315321 is about 34717.6514326646. The cubic root of 1205315321 is about 1064.2252503421.

The spelling of 1205315321 in words is "one billion, two hundred five million, three hundred fifteen thousand, three hundred twenty-one".