16721502125 has 32 divisors (see below), whose sum is σ = 21004244352. Its totient is φ = 13290480000.

The previous prime is 16721502103. The next prime is 16721502157. The reversal of 16721502125 is 52120512761.

It is not a de Polignac number, because 16721502125 - 2¹² = 16721498029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16721502091 and 16721502100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20617970 + ... + 20618780.

It is an arithmetic number, because the mean of its divisors is an integer number (656382636).

Almost surely, 2^16721502125 is an apocalyptic number.

It is an amenable number.

16721502125 is a deficient number, since it is larger than the sum of its proper divisors (4282742227).

16721502125 is an equidigital number, since it uses as much as digits as its factorization.

16721502125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 16721502125 in words is "sixteen billion, seven hundred twenty-one million, five hundred two thousand, one hundred twenty-five".