13212221213021 has 4 divisors (see below), whose sum is σ = 13638421897344. Its totient is φ = 12786020528700.

The previous prime is 13212221212913. The next prime is 13212221213027. The reversal of 13212221213021 is 12031212221231.

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 13212221213021 - 2¹⁰ = 13212221211997 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 (13212221213027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213100342115 + ... + 213100342176.

It is an arithmetic number, because the mean of its divisors is an integer number (3409605474336).

Almost surely, 2^{13212221213021} is an apocalyptic number.

It is an amenable number.

13212221213021 is a deficient number, since it is larger than the sum of its proper divisors (426200684323).

13212221213021 is an equidigital number, since it uses as much as digits as its factorization.

13212221213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426200684322.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 13212221213021 its reverse (12031212221231), we get a palindrome (25243433434252).

The spelling of 13212221213021 in words is "thirteen trillion, two hundred twelve billion, two hundred twenty-one million, two hundred thirteen thousand, twenty-one".