12634421 has 4 divisors (see below), whose sum is σ = 12649644. Its totient is φ = 12619200.

The previous prime is 12634403. The next prime is 12634423. The reversal of 12634421 is 12443621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12443621 = 23 ⋅541027.

It can be written as a sum of positive squares in 2 ways, for example, as 972196 + 11662225 = 986^2 + 3415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12634421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12634423) 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, 6290 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (3162411).

Almost surely, 2^12634421 is an apocalyptic number.

It is an amenable number.

12634421 is a deficient number, since it is larger than the sum of its proper divisors (15223).

12634421 is an equidigital number, since it uses as much as digits as its factorization.

12634421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15222.

The product of its digits is 1152, while the sum is 23.

The square root of 12634421 is about 3554.4930721553. The cubic root of 12634421 is about 232.9083800476.

The spelling of 12634421 in words is "twelve million, six hundred thirty-four thousand, four hundred twenty-one".