13242421 has 4 divisors (see below), whose sum is σ = 13492332. Its totient is φ = 12992512.

The previous prime is 13242407. The next prime is 13242443. The reversal of 13242421 is 12424231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9579025 + 3663396 = 3095^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 13242421 - 2⁷ = 13242293 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 (13242121) 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, 124876 + ... + 124981.

It is an arithmetic number, because the mean of its divisors is an integer number (3373083).

Almost surely, 2^13242421 is an apocalyptic number.

It is an amenable number.

13242421 is a deficient number, since it is larger than the sum of its proper divisors (249911).

13242421 is an equidigital number, since it uses as much as digits as its factorization.

13242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249910.

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

The square root of 13242421 is about 3639.0137400125. The cubic root of 13242421 is about 236.5860482757.

Adding to 13242421 its reverse (12424231), we get a palindrome (25666652).

The spelling of 13242421 in words is "thirteen million, two hundred forty-two thousand, four hundred twenty-one".