16721226371 has 4 divisors (see below), whose sum is σ = 16721502672. Its totient is φ = 16720950072.

The previous prime is 16721226359. The next prime is 16721226391. The reversal of 16721226371 is 17362212761.

16721226371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16721226371 is a prime.

It is a super-2 number, since 2×16721226371² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16721226391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3860 + ... + 182913.

It is an arithmetic number, because the mean of its divisors is an integer number (4180375668).

Almost surely, 2^16721226371 is an apocalyptic number.

16721226371 is a deficient number, since it is larger than the sum of its proper divisors (276301).

16721226371 is an equidigital number, since it uses as much as digits as its factorization.

16721226371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276300.

The product of its digits is 42336, while the sum is 38.

The spelling of 16721226371 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-six thousand, three hundred seventy-one".