12663621 has 20 divisors (see below), whose sum is σ = 19166400. Its totient is φ = 8331336.

The previous prime is 12663619. The next prime is 12663653. The reversal of 12663621 is 12636621.

12663621 is a `hidden beast` number, since 1 + 2 + 6 + 636 + 21 = 666.

It is not a de Polignac number, because 12663621 - 2¹ = 12663619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663601) 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 19 ways as a sum of consecutive naturals, for example, 5410 + ... + 7388.

It is an arithmetic number, because the mean of its divisors is an integer number (958320).

Almost surely, 2^12663621 is an apocalyptic number.

It is an amenable number.

12663621 is a deficient number, since it is larger than the sum of its proper divisors (6502779).

12663621 is an equidigital number, since it uses as much as digits as its factorization.

12663621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070 (or 2061 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 12663621 is about 3558.5981790587. The cubic root of 12663621 is about 233.0876704718.

Subtracting from 12663621 its reverse (12636621), we obtain a cube (27000 = 30³).

The spelling of 12663621 in words is "twelve million, six hundred sixty-three thousand, six hundred twenty-one".