13221322021 has 4 divisors (see below), whose sum is σ = 13276641600. Its totient is φ = 13166002444.

The previous prime is 13221322019. The next prime is 13221322043. The reversal of 13221322021 is 12022312231.

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 13221322021 - 2¹ = 13221322019 is a prime.

It is a super-3 number, since 3×13221322021³ (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 13221322021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221329021) 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, 27659431 + ... + 27659908.

It is an arithmetic number, because the mean of its divisors is an integer number (3319160400).

Almost surely, 2^13221322021 is an apocalyptic number.

It is an amenable number.

13221322021 is a deficient number, since it is larger than the sum of its proper divisors (55319579).

13221322021 is an equidigital number, since it uses as much as digits as its factorization.

13221322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55319578.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13221322021 its reverse (12022312231), we get a palindrome (25243634252).

The spelling of 13221322021 in words is "thirteen billion, two hundred twenty-one million, three hundred twenty-two thousand, twenty-one".