221445321 has 8 divisors (see below), whose sum is σ = 295389984. Its totient is φ = 147565440.

The previous prime is 221445317. The next prime is 221445331. The reversal of 221445321 is 123544122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221445321 - 2² = 221445317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221445291 and 221445300.

It is not an unprimeable number, because it can be changed into a prime (221445331) 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, 7560 + ... + 22361.

It is an arithmetic number, because the mean of its divisors is an integer number (36923748).

Almost surely, 2^221445321 is an apocalyptic number.

It is an amenable number.

221445321 is a deficient number, since it is larger than the sum of its proper divisors (73944663).

221445321 is a wasteful number, since it uses less digits than its factorization.

221445321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32391.

The product of its digits is 1920, while the sum is 24.

The square root of 221445321 is about 14881.0389758242. The cubic root of 221445321 is about 605.0001784941. Note that the first 3 decimals are identical.

Adding to 221445321 its reverse (123544122), we get a palindrome (344989443).

The spelling of 221445321 in words is "two hundred twenty-one million, four hundred forty-five thousand, three hundred twenty-one".