16635067221 has 8 divisors (see below), whose sum is σ = 22395430720. Its totient is φ = 10982374272.

The previous prime is 16635067219. The next prime is 16635067259. The reversal of 16635067221 is 12276053661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16635067221 - 2¹ = 16635067219 is a prime.

It is a super-2 number, since 2×16635067221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16635067221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16635067291) 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 7 ways as a sum of consecutive naturals, for example, 26917276 + ... + 26917893.

It is an arithmetic number, because the mean of its divisors is an integer number (2799428840).

Almost surely, 2^16635067221 is an apocalyptic number.

It is an amenable number.

16635067221 is a deficient number, since it is larger than the sum of its proper divisors (5760363499).

16635067221 is a wasteful number, since it uses less digits than its factorization.

16635067221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53835275.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 16635067221 in words is "sixteen billion, six hundred thirty-five million, sixty-seven thousand, two hundred twenty-one".