13121332032221 has 16 divisors (see below), whose sum is σ = 15514704700800. Its totient is φ = 10857773521728.

The previous prime is 13121332032167. The next prime is 13121332032247. The reversal of 13121332032221 is 12223023312131.

It is not a de Polignac number, because 13121332032221 - 2³⁰ = 13120258290397 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 (13121332034221) 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, 1993655 + ... + 5497028.

It is an arithmetic number, because the mean of its divisors is an integer number (969669043800).

Almost surely, 2^{13121332032221} is an apocalyptic number.

It is an amenable number.

13121332032221 is a deficient number, since it is larger than the sum of its proper divisors (2393372668579).

13121332032221 is an equidigital number, since it uses as much as digits as its factorization.

13121332032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499348.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 13121332032221 its reverse (12223023312131), we get a palindrome (25344355344352).

The spelling of 13121332032221 in words is "thirteen trillion, one hundred twenty-one billion, three hundred thirty-two million, thirty-two thousand, two hundred twenty-one".