13440223201021 has 4 divisors (see below), whose sum is σ = 13903679173500. Its totient is φ = 12976767228544.

The previous prime is 13440223200991. The next prime is 13440223201033. The reversal of 13440223201021 is 12010232204431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5725439198521 + 7714784002500 = 2392789^2 + 2777550^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440223201021 - 2²⁵ = 13440189646589 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 (13440223201091) 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, 231727986196 + ... + 231727986253.

It is an arithmetic number, because the mean of its divisors is an integer number (3475919793375).

Almost surely, 2^{13440223201021} is an apocalyptic number.

It is an amenable number.

13440223201021 is a deficient number, since it is larger than the sum of its proper divisors (463455972479).

13440223201021 is an equidigital number, since it uses as much as digits as its factorization.

13440223201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463455972478.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 13440223201021 its reverse (12010232204431), we get a palindrome (25450455405452).

The spelling of 13440223201021 in words is "thirteen trillion, four hundred forty billion, two hundred twenty-three million, two hundred one thousand, twenty-one".