12919321 has 4 divisors (see below), whose sum is σ = 13096372. Its totient is φ = 12742272.

The previous prime is 12919301. The next prime is 12919339. The reversal of 12919321 is 12391921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12391921 = 593 ⋅20897.

It can be written as a sum of positive squares in 2 ways, for example, as 5017600 + 7901721 = 2240^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 12919321 - 2¹¹ = 12917273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12919321.

It is not an unprimeable number, because it can be changed into a prime (12919301) 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, 88416 + ... + 88561.

It is an arithmetic number, because the mean of its divisors is an integer number (3274093).

Almost surely, 2^12919321 is an apocalyptic number.

It is an amenable number.

12919321 is a deficient number, since it is larger than the sum of its proper divisors (177051).

12919321 is an equidigital number, since it uses as much as digits as its factorization.

12919321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177050.

The product of its digits is 972, while the sum is 28.

The square root of 12919321 is about 3594.3456984547. The cubic root of 12919321 is about 234.6460402393.

The spelling of 12919321 in words is "twelve million, nine hundred nineteen thousand, three hundred twenty-one".