16721224125 has 16 divisors (see below), whose sum is σ = 27824117568. Its totient is φ = 8917986000.

The previous prime is 16721224109. The next prime is 16721224127. The reversal of 16721224125 is 52142212761.

It is not a de Polignac number, because 16721224125 - 2⁴ = 16721224109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721224127) 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 15 ways as a sum of consecutive naturals, for example, 22294591 + ... + 22295340.

It is an arithmetic number, because the mean of its divisors is an integer number (1739007348).

Almost surely, 2^16721224125 is an apocalyptic number.

16721224125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16721224125 is a deficient number, since it is larger than the sum of its proper divisors (11102893443).

16721224125 is an equidigital number, since it uses as much as digits as its factorization.

16721224125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44589949 (or 44589939 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

Adding to 16721224125 its reverse (52142212761), we get a palindrome (68863436886).

The spelling of 16721224125 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-four thousand, one hundred twenty-five".