16721225001 has 12 divisors (see below), whose sum is σ = 26010794628. Its totient is φ = 10289984544.

The previous prime is 16721224997. The next prime is 16721225039. The reversal of 16721225001 is 10052212761.

16721225001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1419782400 + 15301442601 = 37680^2 + 123699^2 .

It is not a de Polignac number, because 16721225001 - 2² = 16721224997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16721225051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71458110 + ... + 71458343.

It is an arithmetic number, because the mean of its divisors is an integer number (2167566219).

Almost surely, 2^16721225001 is an apocalyptic number.

It is an amenable number.

16721225001 is a deficient number, since it is larger than the sum of its proper divisors (9289569627).

16721225001 is a wasteful number, since it uses less digits than its factorization.

16721225001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142916472 (or 142916469 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 16721225001 its reverse (10052212761), we get a palindrome (26773437762).

The spelling of 16721225001 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-five thousand, one".