13404421 has 4 divisors (see below), whose sum is σ = 13493344. Its totient is φ = 13315500.

The previous prime is 13404407. The next prime is 13404427. The reversal of 13404421 is 12440431.

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 a cyclic number.

It is not a de Polignac number, because 13404421 - 2¹¹ = 13402373 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 (13404427) 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, 44235 + ... + 44536.

It is an arithmetic number, because the mean of its divisors is an integer number (3373336).

Almost surely, 2^13404421 is an apocalyptic number.

It is an amenable number.

13404421 is a deficient number, since it is larger than the sum of its proper divisors (88923).

13404421 is an equidigital number, since it uses as much as digits as its factorization.

13404421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88922.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 13404421 is about 3661.2048563280. The cubic root of 13404421 is about 237.5468923106.

Adding to 13404421 its reverse (12440431), we get a palindrome (25844852).

The spelling of 13404421 in words is "thirteen million, four hundred four thousand, four hundred twenty-one".