12606421 has 4 divisors (see below), whose sum is σ = 12844332. Its totient is φ = 12368512.

The previous prime is 12606409. The next prime is 12606427. The reversal of 12606421 is 12460621.

12606421 = 291² + 292² + ... + 396².

12606421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 6426225 = 2486^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 12606421 - 2¹¹ = 12604373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12606392 and 12606401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12606427) 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, 118876 + ... + 118981.

It is an arithmetic number, because the mean of its divisors is an integer number (3211083).

Almost surely, 2^12606421 is an apocalyptic number.

It is an amenable number.

12606421 is a deficient number, since it is larger than the sum of its proper divisors (237911).

12606421 is an equidigital number, since it uses as much as digits as its factorization.

12606421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237910.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12606421 is about 3550.5522105723. The cubic root of 12606421 is about 232.7361980876.

The spelling of 12606421 in words is "twelve million, six hundred six thousand, four hundred twenty-one".