12621603 has 4 divisors (see below), whose sum is σ = 16828808. Its totient is φ = 8414400.

The previous prime is 12621589. The next prime is 12621607. The reversal of 12621603 is 30612621.

It is a happy number.

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

It is not a de Polignac number, because 12621603 - 2¹⁶ = 12556067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12621603.

It is not an unprimeable number, because it can be changed into a prime (12621607) 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, 2103598 + ... + 2103603.

It is an arithmetic number, because the mean of its divisors is an integer number (4207202).

Almost surely, 2^12621603 is an apocalyptic number.

12621603 is a deficient number, since it is larger than the sum of its proper divisors (4207205).

12621603 is an equidigital number, since it uses as much as digits as its factorization.

12621603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207204.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 12621603 is about 3552.6895445563. The cubic root of 12621603 is about 232.8295892115.

The spelling of 12621603 in words is "twelve million, six hundred twenty-one thousand, six hundred three".