13423421 has 16 divisors (see below), whose sum is σ = 16184448. Its totient is φ = 10982400.

The previous prime is 13423411. The next prime is 13423451. The reversal of 13423421 is 12432431.

It is not a de Polignac number, because 13423421 - 2¹⁰ = 13422397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13423393 and 13423402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13423411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2741 + ... + 5861.

It is an arithmetic number, because the mean of its divisors is an integer number (1011528).

Almost surely, 2^13423421 is an apocalyptic number.

13423421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13423421 is a deficient number, since it is larger than the sum of its proper divisors (2761027).

13423421 is a wasteful number, since it uses less digits than its factorization.

13423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172.

The product of its digits is 576, while the sum is 20.

The square root of 13423421 is about 3663.7987117198. The cubic root of 13423421 is about 237.6590757000.

Adding to 13423421 its reverse (12432431), we get a palindrome (25855852).

The spelling of 13423421 in words is "thirteen million, four hundred twenty-three thousand, four hundred twenty-one".