12703921 has 4 divisors (see below), whose sum is σ = 12912244. Its totient is φ = 12495600.

The previous prime is 12703907. The next prime is 12703927. The reversal of 12703921 is 12930721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12930721 = 89 ⋅145289.

It can be written as a sum of positive squares in 2 ways, for example, as 3370896 + 9333025 = 1836^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 12703921 - 2⁷ = 12703793 is a prime.

It is a super-2 number, since 2×12703921² = 322779217548482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12703927) 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 3 ways as a sum of consecutive naturals, for example, 104070 + ... + 104191.

It is an arithmetic number, because the mean of its divisors is an integer number (3228061).

Almost surely, 2^12703921 is an apocalyptic number.

It is an amenable number.

12703921 is a deficient number, since it is larger than the sum of its proper divisors (208323).

12703921 is an equidigital number, since it uses as much as digits as its factorization.

12703921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208322.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12703921 is about 3564.2560233519. The cubic root of 12703921 is about 233.3346637112.

The spelling of 12703921 in words is "twelve million, seven hundred three thousand, nine hundred twenty-one".