1321325660 has 24 divisors (see below), whose sum is σ = 2794752240. Its totient is φ = 524726784.

The previous prime is 1321325657. The next prime is 1321325717. The reversal of 1321325660 is 665231231.

It is a super-3 number, since 3×1321325660³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

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, 234869 + ... + 240428.

It is an arithmetic number, because the mean of its divisors is an integer number (116448010).

Almost surely, 2^1321325660 is an apocalyptic number.

1321325660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321325660 is an abundant number, since it is smaller than the sum of its proper divisors (1473426580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321325660 is a wasteful number, since it uses less digits than its factorization.

1321325660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475445 (or 475443 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1321325660 is about 36350.0434662739. The cubic root of 1321325660 is about 1097.3284092722.

Adding to 1321325660 its reverse (665231231), we get a palindrome (1986556891).

The spelling of 1321325660 in words is "one billion, three hundred twenty-one million, three hundred twenty-five thousand, six hundred sixty".