16721155107 has 16 divisors (see below), whose sum is σ = 25441598880. Its totient is φ = 10846154016.

The previous prime is 16721155097. The next prime is 16721155109. The reversal of 16721155107 is 70155112761.

It is a happy number.

It is not a de Polignac number, because 16721155107 - 2¹⁵ = 16721122339 is a prime.

It is a super-2 number, since 2×16721155107² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16721155109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8367948 + ... + 8369945.

It is an arithmetic number, because the mean of its divisors is an integer number (1590099930).

Almost surely, 2^16721155107 is an apocalyptic number.

16721155107 is a deficient number, since it is larger than the sum of its proper divisors (8720443773).

16721155107 is a wasteful number, since it uses less digits than its factorization.

16721155107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16737939 (or 16737933 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 36.

Adding to 16721155107 its reverse (70155112761), we get a palindrome (86876267868).

The spelling of 16721155107 in words is "sixteen billion, seven hundred twenty-one million, one hundred fifty-five thousand, one hundred seven".