12773921 has 4 divisors (see below), whose sum is σ = 12817812. Its totient is φ = 12730032.

The previous prime is 12773911. The next prime is 12773923. The reversal of 12773921 is 12937721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12937721 = 317 ⋅40813.

It can be written as a sum of positive squares in 2 ways, for example, as 5456896 + 7317025 = 2336^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12773921 - 2⁶ = 12773857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12773923) 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, 21506 + ... + 22091.

It is an arithmetic number, because the mean of its divisors is an integer number (3204453).

Almost surely, 2^12773921 is an apocalyptic number.

It is an amenable number.

12773921 is a deficient number, since it is larger than the sum of its proper divisors (43891).

12773921 is an equidigital number, since it uses as much as digits as its factorization.

12773921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43890.

The product of its digits is 5292, while the sum is 32.

The square root of 12773921 is about 3574.0622546341. The cubic root of 12773921 is about 233.7624455040.

The spelling of 12773921 in words is "twelve million, seven hundred seventy-three thousand, nine hundred twenty-one".