13221313021 has 8 divisors (see below), whose sum is σ = 15317059904. Its totient is φ = 11177313120.

The previous prime is 13221313003. The next prime is 13221313037. The reversal of 13221313021 is 12031312231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13221313021 - 2¹⁹ = 13220788733 is a prime.

It is a super-3 number, since 3×13221313021³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13221313021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221313081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12936195 + ... + 12937216.

It is an arithmetic number, because the mean of its divisors is an integer number (1914632488).

Almost surely, 2^13221313021 is an apocalyptic number.

It is an amenable number.

13221313021 is a deficient number, since it is larger than the sum of its proper divisors (2095746883).

13221313021 is an equidigital number, since it uses as much as digits as its factorization.

13221313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25873491.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13221313021 its reverse (12031312231), we get a palindrome (25252625252).

The spelling of 13221313021 in words is "thirteen billion, two hundred twenty-one million, three hundred thirteen thousand, twenty-one".