13005223421 has 4 divisors (see below), whose sum is σ = 13006121472. Its totient is φ = 13004325372.

The previous prime is 13005223393. The next prime is 13005223453. The reversal of 13005223421 is 12432250031.

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 13005223421 - 2¹⁰ = 13005222397 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 (13005223481) 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, 426941 + ... + 456386.

It is an arithmetic number, because the mean of its divisors is an integer number (3251530368).

Almost surely, 2^13005223421 is an apocalyptic number.

It is an amenable number.

13005223421 is a deficient number, since it is larger than the sum of its proper divisors (898051).

13005223421 is an equidigital number, since it uses as much as digits as its factorization.

13005223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898050.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 13005223421 its reverse (12432250031), we get a palindrome (25437473452).

The spelling of 13005223421 in words is "thirteen billion, five million, two hundred twenty-three thousand, four hundred twenty-one".