12921451 has 4 divisors (see below), whose sum is σ = 13338304. Its totient is φ = 12504600.

The previous prime is 12921449. The next prime is 12921527. The reversal of 12921451 is 15412921.

It is a happy number.

12921451 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.

It is a cyclic number.

It is not a de Polignac number, because 12921451 - 2¹ = 12921449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12924451) 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, 208380 + ... + 208441.

It is an arithmetic number, because the mean of its divisors is an integer number (3334576).

Almost surely, 2^12921451 is an apocalyptic number.

12921451 is a deficient number, since it is larger than the sum of its proper divisors (416853).

12921451 is an equidigital number, since it uses as much as digits as its factorization.

12921451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416852.

The product of its digits is 720, while the sum is 25.

The square root of 12921451 is about 3594.6419849548. The cubic root of 12921451 is about 234.6589348438.

The spelling of 12921451 in words is "twelve million, nine hundred twenty-one thousand, four hundred fifty-one".