16721226155 has 4 divisors (see below), whose sum is σ = 20065471392. Its totient is φ = 13376980920.

The previous prime is 16721226131. The next prime is 16721226169. The reversal of 16721226155 is 55162212761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55162212761 = 9547 ⋅5777963.

It is not a de Polignac number, because 16721226155 - 2¹² = 16721222059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1672122611 + ... + 1672122620.

It is an arithmetic number, because the mean of its divisors is an integer number (5016367848).

Almost surely, 2^16721226155 is an apocalyptic number.

16721226155 is a deficient number, since it is larger than the sum of its proper divisors (3344245237).

16721226155 is an equidigital number, since it uses as much as digits as its factorization.

16721226155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344245236.

The product of its digits is 50400, while the sum is 38.

The spelling of 16721226155 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-six thousand, one hundred fifty-five".