12391421 has 8 divisors (see below), whose sum is σ = 14270784. Its totient is φ = 10539360.

The previous prime is 12391403. The next prime is 12391427. The reversal of 12391421 is 12419321.

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

It is a cyclic number.

It is not a de Polignac number, because 12391421 - 2¹⁴ = 12375037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391427) 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, 5840 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (1783848).

Almost surely, 2^12391421 is an apocalyptic number.

It is an amenable number.

12391421 is a deficient number, since it is larger than the sum of its proper divisors (1879363).

12391421 is a wasteful number, since it uses less digits than its factorization.

12391421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13651.

The product of its digits is 432, while the sum is 23.

The square root of 12391421 is about 3520.1450254215. The cubic root of 12391421 is about 231.4055144832.

The spelling of 12391421 in words is "twelve million, three hundred ninety-one thousand, four hundred twenty-one".