12704921 has 2 divisors, whose sum is σ = 12704922. Its totient is φ = 12704920.

The previous prime is 12704917. The next prime is 12704927. The reversal of 12704921 is 12940721.

12704921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9241600 + 3463321 = 3040^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 12704921 - 2² = 12704917 is a prime.

It is a super-2 number, since 2×12704921² = 322830035232482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12704927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6352460 + 6352461.

It is an arithmetic number, because the mean of its divisors is an integer number (6352461).

Almost surely, 2^12704921 is an apocalyptic number.

It is an amenable number.

12704921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12704921 is an equidigital number, since it uses as much as digits as its factorization.

12704921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 12704921 is about 3564.3963023211. The cubic root of 12704921 is about 233.3407859298.

The spelling of 12704921 in words is "twelve million, seven hundred four thousand, nine hundred twenty-one".