13221120021 has 8 divisors (see below), whose sum is σ = 17629921344. Its totient is φ = 8813199360.

The previous prime is 13221120019. The next prime is 13221120023. The reversal of 13221120021 is 12002112231.

It is an interprime number because it is at equal distance from previous prime (13221120019) and next prime (13221120023).

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

It is not a de Polignac number, because 13221120021 - 2¹ = 13221120019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184300 + ... + 245781.

It is an arithmetic number, because the mean of its divisors is an integer number (2203740168).

Almost surely, 2^13221120021 is an apocalyptic number.

It is an amenable number.

13221120021 is a deficient number, since it is larger than the sum of its proper divisors (4408801323).

13221120021 is a wasteful number, since it uses less digits than its factorization.

13221120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440331.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 13221120021 its reverse (12002112231), we get a palindrome (25223232252).

The spelling of 13221120021 in words is "thirteen billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".