1320912321 has 16 divisors (see below), whose sum is σ = 1810859904. Its totient is φ = 855840384.

The previous prime is 1320912317. The next prime is 1320912323. The reversal of 1320912321 is 1232190231.

1320912321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1320912321 - 2² = 1320912317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320912291 and 1320912300.

It is not an unprimeable number, because it can be changed into a prime (1320912323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99540 + ... + 112026.

It is an arithmetic number, because the mean of its divisors is an integer number (113178744).

Almost surely, 2^1320912321 is an apocalyptic number.

It is an amenable number.

1320912321 is a deficient number, since it is larger than the sum of its proper divisors (489947583).

1320912321 is a wasteful number, since it uses less digits than its factorization.

1320912321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13480.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1320912321 is about 36344.3574850347. The cubic root of 1320912321 is about 1097.2139747199.

The spelling of 1320912321 in words is "one billion, three hundred twenty million, nine hundred twelve thousand, three hundred twenty-one".