12921867 has 24 divisors (see below), whose sum is σ = 21425664. Its totient is φ = 7351344.

The previous prime is 12921863. The next prime is 12921893. The reversal of 12921867 is 76812921.

12921867 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12921867 - 2² = 12921863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12921863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27678 + ... + 28140.

It is an arithmetic number, because the mean of its divisors is an integer number (892736).

Almost surely, 2^12921867 is an apocalyptic number.

12921867 is a deficient number, since it is larger than the sum of its proper divisors (8503797).

12921867 is a wasteful number, since it uses less digits than its factorization.

12921867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 916 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 12921867 is about 3594.6998483879. The cubic root of 12921867 is about 234.6614530612.

The spelling of 12921867 in words is "twelve million, nine hundred twenty-one thousand, eight hundred sixty-seven".