12633921 has 16 divisors (see below), whose sum is σ = 18774720. Its totient is φ = 8396640.

The previous prime is 12633911. The next prime is 12633931. The reversal of 12633921 is 12933621.

12633921 is a `hidden beast` number, since 1 + 2 + 633 + 9 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (12633911) and next prime (12633931).

It is not a de Polignac number, because 12633921 - 2⁹ = 12633409 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (12633911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12781 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (1173420).

Almost surely, 2^12633921 is an apocalyptic number.

It is an amenable number.

12633921 is a deficient number, since it is larger than the sum of its proper divisors (6140799).

12633921 is an equidigital number, since it uses as much as digits as its factorization.

12633921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453 (or 1447 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 12633921 is about 3554.4227379421. The cubic root of 12633921 is about 232.9053076017.

It can be divided in two parts, 1263 and 3921, that added together give a square (5184 = 72²).

The spelling of 12633921 in words is "twelve million, six hundred thirty-three thousand, nine hundred twenty-one".