16721222321 has 8 divisors (see below), whose sum is σ = 17706561120. Its totient is φ = 15736076608.

The previous prime is 16721222293. The next prime is 16721222351. The reversal of 16721222321 is 12322212761.

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

It is a cyclic number.

It is not a de Polignac number, because 16721222321 - 2¹⁴ = 16721205937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16721222351) 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, 154370 + ... + 239316.

It is an arithmetic number, because the mean of its divisors is an integer number (2213320140).

Almost surely, 2^16721222321 is an apocalyptic number.

It is an amenable number.

16721222321 is a deficient number, since it is larger than the sum of its proper divisors (985338799).

16721222321 is a wasteful number, since it uses less digits than its factorization.

16721222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96543.

The product of its digits is 4032, while the sum is 29.

The spelling of 16721222321 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty-one".