1321330305 has 8 divisors (see below), whose sum is σ = 2114128512. Its totient is φ = 704709488.

The previous prime is 1321330279. The next prime is 1321330337. The reversal of 1321330305 is 5030331231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321330305 - 2¹⁰ = 1321329281 is a prime.

It is a super-2 number, since 2×1321330305² = 3491827549822786050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44044329 + ... + 44044358.

It is an arithmetic number, because the mean of its divisors is an integer number (264266064).

Almost surely, 2^1321330305 is an apocalyptic number.

1321330305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321330305 is a deficient number, since it is larger than the sum of its proper divisors (792798207).

1321330305 is an equidigital number, since it uses as much as digits as its factorization.

1321330305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88088695.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 1321330305 is about 36350.1073588511. The cubic root of 1321330305 is about 1097.3296951234.

Adding to 1321330305 its reverse (5030331231), we get a palindrome (6351661536).

The spelling of 1321330305 in words is "one billion, three hundred twenty-one million, three hundred thirty thousand, three hundred five".