221544342321 has 4 divisors (see below), whose sum is σ = 295392456432. Its totient is φ = 147696228212.

The previous prime is 221544342319. The next prime is 221544342367. The reversal of 221544342321 is 123243445122.

It is a happy number.

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 221544342321 - 2¹ = 221544342319 is a prime.

It is a super-2 number, since 2×221544342321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221544342311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36924057051 + ... + 36924057056.

It is an arithmetic number, because the mean of its divisors is an integer number (73848114108).

Almost surely, 2^221544342321 is an apocalyptic number.

It is an amenable number.

221544342321 is a deficient number, since it is larger than the sum of its proper divisors (73848114111).

221544342321 is an equidigital number, since it uses as much as digits as its factorization.

221544342321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73848114110.

The product of its digits is 46080, while the sum is 33.

Adding to 221544342321 its reverse (123243445122), we get a palindrome (344787787443).

The spelling of 221544342321 in words is "two hundred twenty-one billion, five hundred forty-four million, three hundred forty-two thousand, three hundred twenty-one".