16352501221 has 16 divisors (see below), whose sum is σ = 19909209600. Its totient is φ = 13118729328.

The previous prime is 16352501219. The next prime is 16352501257. The reversal of 16352501221 is 12210525361.

It is a cyclic number.

It is not a de Polignac number, because 16352501221 - 2¹ = 16352501219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16352501221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16352501201) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 729631 + ... + 751708.

It is an arithmetic number, because the mean of its divisors is an integer number (1244325600).

Almost surely, 2^16352501221 is an apocalyptic number.

It is an amenable number.

16352501221 is a deficient number, since it is larger than the sum of its proper divisors (3556708379).

16352501221 is a wasteful number, since it uses less digits than its factorization.

16352501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481448.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 16352501221 in words is "sixteen billion, three hundred fifty-two million, five hundred one thousand, two hundred twenty-one".