13442004221 has 4 divisors (see below), whose sum is σ = 13465628700. Its totient is φ = 13418379744.

The previous prime is 13442004197. The next prime is 13442004229. The reversal of 13442004221 is 12240024431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12240024431 = 131 ⋅93435301.

It can be written as a sum of positive squares in 2 ways, for example, as 2594781721 + 10847222500 = 50939^2 + 104150^2 .

It is a cyclic number.

It is not a de Polignac number, because 13442004221 - 2¹⁸ = 13441742077 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 (13442004229) 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, 11811386 + ... + 11812523.

It is an arithmetic number, because the mean of its divisors is an integer number (3366407175).

Almost surely, 2^13442004221 is an apocalyptic number.

It is an amenable number.

13442004221 is a deficient number, since it is larger than the sum of its proper divisors (23624479).

13442004221 is an equidigital number, since it uses as much as digits as its factorization.

13442004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23624478.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 13442004221 its reverse (12240024431), we get a palindrome (25682028652).

The spelling of 13442004221 in words is "thirteen billion, four hundred forty-two million, four thousand, two hundred twenty-one".