13031211033221 has 4 divisors (see below), whose sum is σ = 13225706720352. Its totient is φ = 12836715346092.

The previous prime is 13031211033209. The next prime is 13031211033289. The reversal of 13031211033221 is 12233011213031.

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 13031211033221 - 2¹⁸ = 13031210771077 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 (13031211032221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97247843465 + ... + 97247843598.

It is an arithmetic number, because the mean of its divisors is an integer number (3306426680088).

Almost surely, 2^{13031211033221} is an apocalyptic number.

It is an amenable number.

13031211033221 is a deficient number, since it is larger than the sum of its proper divisors (194495687131).

13031211033221 is an equidigital number, since it uses as much as digits as its factorization.

13031211033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194495687130.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 13031211033221 its reverse (12233011213031), we get a palindrome (25264222246252).

The spelling of 13031211033221 in words is "thirteen trillion, thirty-one billion, two hundred eleven million, thirty-three thousand, two hundred twenty-one".