221064321 has 8 divisors (see below), whose sum is σ = 296630464. Its totient is φ = 146437200.

The previous prime is 221064301. The next prime is 221064377. The reversal of 221064321 is 123460122.

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

It is not a de Polignac number, because 221064321 - 2⁹ = 221063809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221064301) 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, 234205 + ... + 235146.

It is an arithmetic number, because the mean of its divisors is an integer number (37078808).

Almost surely, 2^221064321 is an apocalyptic number.

It is an amenable number.

221064321 is a deficient number, since it is larger than the sum of its proper divisors (75566143).

221064321 is a wasteful number, since it uses less digits than its factorization.

221064321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469511.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 221064321 is about 14868.2319392724. The cubic root of 221064321 is about 604.6530086837.

The spelling of 221064321 in words is "two hundred twenty-one million, sixty-four thousand, three hundred twenty-one".