12981621 has 8 divisors (see below), whose sum is σ = 17424064. Its totient is φ = 8596800.

The previous prime is 12981613. The next prime is 12981623. The reversal of 12981621 is 12618921.

It is a happy number.

12981621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12981621 - 2³ = 12981613 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 (12981623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13876 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (2178008).

Almost surely, 2^12981621 is an apocalyptic number.

It is an amenable number.

12981621 is a deficient number, since it is larger than the sum of its proper divisors (4442443).

12981621 is a wasteful number, since it uses less digits than its factorization.

12981621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28811.

The product of its digits is 1728, while the sum is 30.

The square root of 12981621 is about 3603.0016652785. The cubic root of 12981621 is about 235.0226083575.

The spelling of 12981621 in words is "twelve million, nine hundred eighty-one thousand, six hundred twenty-one".