13648421 has 4 divisors (see below), whose sum is σ = 13656192. Its totient is φ = 13640652.

The previous prime is 13648391. The next prime is 13648429. The reversal of 13648421 is 12484631.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12484631 = 313 ⋅39887.

It is a cyclic number.

It is not a de Polignac number, because 13648421 - 2¹⁴ = 13632037 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 (13648429) 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, 140 + ... + 5226.

It is an arithmetic number, because the mean of its divisors is an integer number (3414048).

Almost surely, 2^13648421 is an apocalyptic number.

It is an amenable number.

13648421 is a deficient number, since it is larger than the sum of its proper divisors (7771).

13648421 is an equidigital number, since it uses as much as digits as its factorization.

13648421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770.

The product of its digits is 4608, while the sum is 29.

The square root of 13648421 is about 3694.3769434101. The cubic root of 13648421 is about 238.9795854484.

The spelling of 13648421 in words is "thirteen million, six hundred forty-eight thousand, four hundred twenty-one".