12893821 has 4 divisors (see below), whose sum is σ = 13014432. Its totient is φ = 12773212.

The previous prime is 12893819. The next prime is 12893831. The reversal of 12893821 is 12839821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12839821 = 331 ⋅38791.

It is a cyclic number.

It is not a de Polignac number, because 12893821 - 2¹ = 12893819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12893831) 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, 60145 + ... + 60358.

It is an arithmetic number, because the mean of its divisors is an integer number (3253608).

Almost surely, 2^12893821 is an apocalyptic number.

It is an amenable number.

12893821 is a deficient number, since it is larger than the sum of its proper divisors (120611).

12893821 is a wasteful number, since it uses less digits than its factorization.

12893821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120610.

The product of its digits is 6912, while the sum is 34.

The square root of 12893821 is about 3590.7967082529. The cubic root of 12893821 is about 234.4915580481.

The spelling of 12893821 in words is "twelve million, eight hundred ninety-three thousand, eight hundred twenty-one".