13843366421 has 4 divisors (see below), whose sum is σ = 13843991232. Its totient is φ = 13842741612.

The previous prime is 13843366409. The next prime is 13843366457. The reversal of 13843366421 is 12466334831.

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 13843366421 - 2³⁰ = 12769624597 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 (13843366721) 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, 277901 + ... + 323906.

It is an arithmetic number, because the mean of its divisors is an integer number (3460997808).

Almost surely, 2^13843366421 is an apocalyptic number.

It is an amenable number.

13843366421 is a deficient number, since it is larger than the sum of its proper divisors (624811).

13843366421 is an equidigital number, since it uses as much as digits as its factorization.

13843366421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624810.

The product of its digits is 248832, while the sum is 41.

The spelling of 13843366421 in words is "thirteen billion, eight hundred forty-three million, three hundred sixty-six thousand, four hundred twenty-one".