12989621 has 4 divisors (see below), whose sum is σ = 13047072. Its totient is φ = 12932172.

The previous prime is 12989591. The next prime is 12989623. The reversal of 12989621 is 12698921.

12989621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12698921 = 23 ⋅552127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12989621 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 (12989623) 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, 28385 + ... + 28838.

It is an arithmetic number, because the mean of its divisors is an integer number (3261768).

Almost surely, 2^12989621 is an apocalyptic number.

It is an amenable number.

12989621 is a deficient number, since it is larger than the sum of its proper divisors (57451).

12989621 is an equidigital number, since it uses as much as digits as its factorization.

12989621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57450.

The product of its digits is 15552, while the sum is 38.

The square root of 12989621 is about 3604.1116797347. Note that the first 3 decimals coincide. The cubic root of 12989621 is about 235.0708764635.

The spelling of 12989621 in words is "twelve million, nine hundred eighty-nine thousand, six hundred twenty-one".