16866221127 has 32 divisors (see below), whose sum is σ = 26347991040. Its totient is φ = 9395546880.

The previous prime is 16866221107. The next prime is 16866221129. The reversal of 16866221127 is 72112266861.

It is a happy number.

It is not a de Polignac number, because 16866221127 - 2²⁷ = 16732003399 is a prime.

It is a super-2 number, since 2×16866221127² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16866221129) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1232173 + ... + 1245785.

It is an arithmetic number, because the mean of its divisors is an integer number (823374720).

Almost surely, 2^16866221127 is an apocalyptic number.

16866221127 is a deficient number, since it is larger than the sum of its proper divisors (9481769913).

16866221127 is a wasteful number, since it uses less digits than its factorization.

16866221127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15103.

The product of its digits is 96768, while the sum is 42.

Adding to 16866221127 its reverse (72112266861), we get a palindrome (88978487988).

The spelling of 16866221127 in words is "sixteen billion, eight hundred sixty-six million, two hundred twenty-one thousand, one hundred twenty-seven".