12966921 has 24 divisors (see below), whose sum is σ = 20558304. Its totient is φ = 7810560.

The previous prime is 12966881. The next prime is 12966929.

12966921 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12966921 - 2¹⁵ = 12934153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12966929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22185 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (856596).

Almost surely, 2^12966921 is an apocalyptic number.

12966921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12966921 is a deficient number, since it is larger than the sum of its proper divisors (7591383).

12966921 is a wasteful number, since it uses less digits than its factorization.

12966921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 818 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 12966921 is about 3600.9611217007. The cubic root of 12966921 is about 234.9338639906.

The spelling of 12966921 in words is "twelve million, nine hundred sixty-six thousand, nine hundred twenty-one".