1321655330 has 16 divisors (see below), whose sum is σ = 2394948600. Its totient is φ = 525113472.

The previous prime is 1321655323. The next prime is 1321655351. The reversal of 1321655330 is 335561231.

It can be written as a sum of positive squares in 4 ways, for example, as 991179289 + 330476041 = 31483^2 + 18179^2 .

It is a super-2 number, since 2×1321655330² = 3493545622634817800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321655293 and 1321655302.

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, 442019 + ... + 444998.

Almost surely, 2^1321655330 is an apocalyptic number.

1321655330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321655330 is a deficient number, since it is larger than the sum of its proper divisors (1073293270).

1321655330 is a wasteful number, since it uses less digits than its factorization.

1321655330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887173.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 1321655330 is about 36354.5778410367. The cubic root of 1321655330 is about 1097.4196626212.

The spelling of 1321655330 in words is "one billion, three hundred twenty-one million, six hundred fifty-five thousand, three hundred thirty".