221312311303321 has 8 divisors (see below), whose sum is σ = 254013885201024. Its totient is φ = 188882119762080.

The previous prime is 221312311303271. The next prime is 221312311303361. The reversal of 221312311303321 is 123303113213122.

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 221312311303321 - 2²¹ = 221312309206169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221312311303321.

It is not an unprimeable number, because it can be changed into a prime (221312311303361) 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, 67845587365 + ... + 67845590626.

It is an arithmetic number, because the mean of its divisors is an integer number (31751735650128).

Almost surely, 2^{221312311303321} is an apocalyptic number.

It is an amenable number.

221312311303321 is a deficient number, since it is larger than the sum of its proper divisors (32701573897703).

221312311303321 is a wasteful number, since it uses less digits than its factorization.

221312311303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135691178231.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 221312311303321 its reverse (123303113213122), we get a palindrome (344615424516443).

The spelling of 221312311303321 in words is "two hundred twenty-one trillion, three hundred twelve billion, three hundred eleven million, three hundred three thousand, three hundred twenty-one".