13442421 has 4 divisors (see below), whose sum is σ = 17923232. Its totient is φ = 8961612.

The previous prime is 13442417. The next prime is 13442441. The reversal of 13442421 is 12424431.

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.

It is not a de Polignac number, because 13442421 - 2² = 13442417 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 (13442441) 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, 2240401 + ... + 2240406.

It is an arithmetic number, because the mean of its divisors is an integer number (4480808).

Almost surely, 2^13442421 is an apocalyptic number.

It is an amenable number.

13442421 is a deficient number, since it is larger than the sum of its proper divisors (4480811).

13442421 is an equidigital number, since it uses as much as digits as its factorization.

13442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480810.

The product of its digits is 768, while the sum is 21.

The square root of 13442421 is about 3666.3907320415. The cubic root of 13442421 is about 237.7711532802.

Adding to 13442421 its reverse (12424431), we get a palindrome (25866852).

The spelling of 13442421 in words is "thirteen million, four hundred forty-two thousand, four hundred twenty-one".