221321444324 has 24 divisors (see below), whose sum is σ = 394649635968. Its totient is φ = 108564716000.

The previous prime is 221321444213. The next prime is 221321444327. The reversal of 221321444324 is 423444123122.

It is a happy number.

It is a super-3 number, since 3×221321444324³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (221321444327) 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, 3643199 + ... + 3703449.

It is an arithmetic number, because the mean of its divisors is an integer number (16443734832).

Almost surely, 2^221321444324 is an apocalyptic number.

It is an amenable number.

221321444324 is a deficient number, since it is larger than the sum of its proper divisors (173328191644).

221321444324 is a wasteful number, since it uses less digits than its factorization.

221321444324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77635 (or 77633 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

Adding to 221321444324 its reverse (423444123122), we get a palindrome (644765567446).

The spelling of 221321444324 in words is "two hundred twenty-one billion, three hundred twenty-one million, four hundred forty-four thousand, three hundred twenty-four".