331221331221221 has 8 divisors (see below), whose sum is σ = 382011496035840. Its totient is φ = 281299374352368.

The previous prime is 331221331221217. The next prime is 331221331221239. The reversal of 331221331221221 is 122122133122133.

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

It is a cyclic number.

It is not a de Polignac number, because 331221331221221 - 2² = 331221331221217 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 (331221331221241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217051985621 + ... + 217051987146.

It is an arithmetic number, because the mean of its divisors is an integer number (47751437004480).

Almost surely, 2^{331221331221221} is an apocalyptic number.

It is an amenable number.

331221331221221 is a deficient number, since it is larger than the sum of its proper divisors (50790164814619).

331221331221221 is a wasteful number, since it uses less digits than its factorization.

331221331221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434103972883.

The product of its digits is 5184, while the sum is 29.

Adding to 331221331221221 its reverse (122122133122133), we get a palindrome (453343464343354).

The spelling of 331221331221221 in words is "three hundred thirty-one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-one".