12604021 has 4 divisors (see below), whose sum is σ = 13345452. Its totient is φ = 11862592.

The previous prime is 12604019. The next prime is 12604057. The reversal of 12604021 is 12040621.

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 9696996 + 2907025 = 3114^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12604021 - 2¹ = 12604019 is a prime.

It is a super-2 number, since 2×12604021² = 317722690736882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12603986 and 12604004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12604001) 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, 370690 + ... + 370723.

It is an arithmetic number, because the mean of its divisors is an integer number (3336363).

Almost surely, 2^12604021 is an apocalyptic number.

It is an amenable number.

12604021 is a deficient number, since it is larger than the sum of its proper divisors (741431).

12604021 is an equidigital number, since it uses as much as digits as its factorization.

12604021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741430.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12604021 is about 3550.2142188888. The cubic root of 12604021 is about 232.7214277753.

Adding to 12604021 its reverse (12040621), we get a palindrome (24644642).

The spelling of 12604021 in words is "twelve million, six hundred four thousand, twenty-one".