221312312233321 has 32 divisors (see below), whose sum is σ = 231632110660608. Its totient is φ = 211051745372160.

The previous prime is 221312312233261. The next prime is 221312312233357. The reversal of 221312312233321 is 123332213213122.

It is a cyclic number.

It is not a de Polignac number, because 221312312233321 - 2³¹ = 221310164749673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221312312233381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73209496416 + ... + 73209499438.

It is an arithmetic number, because the mean of its divisors is an integer number (7238503458144).

Almost surely, 2^{221312312233321} is an apocalyptic number.

It is an amenable number.

221312312233321 is a deficient number, since it is larger than the sum of its proper divisors (10319798427287).

221312312233321 is a wasteful number, since it uses less digits than its factorization.

221312312233321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521.

The product of its digits is 15552, while the sum is 31.

Adding to 221312312233321 its reverse (123332213213122), we get a palindrome (344644525446443).

The spelling of 221312312233321 in words is "two hundred twenty-one trillion, three hundred twelve billion, three hundred twelve million, two hundred thirty-three thousand, three hundred twenty-one".