13445423345221 has 16 divisors (see below), whose sum is σ = 15398398439424. Its totient is φ = 11500503254064.

The previous prime is 13445423345213. The next prime is 13445423345257. The reversal of 13445423345221 is 12254332454431.

It is a cyclic number.

It is not a de Polignac number, because 13445423345221 - 2³ = 13445423345213 is a prime.

It is a super-2 number, since 2×13445423345221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13445423349221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33414996 + ... + 33814978.

It is an arithmetic number, because the mean of its divisors is an integer number (962399902464).

Almost surely, 2^{13445423345221} is an apocalyptic number.

It is an amenable number.

13445423345221 is a deficient number, since it is larger than the sum of its proper divisors (1952975094203).

13445423345221 is an equidigital number, since it uses as much as digits as its factorization.

13445423345221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410040.

The product of its digits is 1382400, while the sum is 43.

Adding to 13445423345221 its reverse (12254332454431), we get a palindrome (25699755799652).

The spelling of 13445423345221 in words is "thirteen trillion, four hundred forty-five billion, four hundred twenty-three million, three hundred forty-five thousand, two hundred twenty-one".