16726221321 has 8 divisors (see below), whose sum is σ = 22307962080. Its totient is φ = 11147647392.

The previous prime is 16726221311. The next prime is 16726221361. The reversal of 16726221321 is 12312262761.

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

It is not a de Polignac number, because 16726221321 - 2⁶ = 16726221257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16726221311) 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, 779355 + ... + 800528.

It is an arithmetic number, because the mean of its divisors is an integer number (2788495260).

Almost surely, 2^16726221321 is an apocalyptic number.

It is an amenable number.

16726221321 is a deficient number, since it is larger than the sum of its proper divisors (5581740759).

16726221321 is a wasteful number, since it uses less digits than its factorization.

16726221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583415.

The product of its digits is 12096, while the sum is 33.

The spelling of 16726221321 in words is "sixteen billion, seven hundred twenty-six million, two hundred twenty-one thousand, three hundred twenty-one".