221223144321 has 24 divisors (see below), whose sum is σ = 325232063520. Its totient is φ = 144861264000.

The previous prime is 221223144319. The next prime is 221223144413. The reversal of 221223144321 is 123441322122.

221223144321 is a `hidden beast` number, since 2 + 2 + 1 + 22 + 314 + 4 + 321 = 666.

It is not a de Polignac number, because 221223144321 - 2¹ = 221223144319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221223144301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464286 + ... + 811176.

It is an arithmetic number, because the mean of its divisors is an integer number (13551335980).

Almost surely, 2^221223144321 is an apocalyptic number.

It is an amenable number.

221223144321 is a deficient number, since it is larger than the sum of its proper divisors (104008919199).

221223144321 is a wasteful number, since it uses less digits than its factorization.

221223144321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348157 (or 348154 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 221223144321 its reverse (123441322122), we get a palindrome (344664466443).

The spelling of 221223144321 in words is "two hundred twenty-one billion, two hundred twenty-three million, one hundred forty-four thousand, three hundred twenty-one".