16355888122221 has 72 divisors (see below), whose sum is σ = 26430925589120. Its totient is φ = 9717448725504.

The previous prime is 16355888122177. The next prime is 16355888122229. The reversal of 16355888122221 is 12222188855361.

16355888122221 is a `hidden beast` number, since 1 + 6 + 3 + 5 + 588 + 8 + 12 + 22 + 21 = 666.

It is not a de Polignac number, because 16355888122221 - 2²² = 16355883927917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16355888122229) 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 71 ways as a sum of consecutive naturals, for example, 98409036 + ... + 98575098.

Almost surely, 2^{16355888122221} is an apocalyptic number.

It is an amenable number.

16355888122221 is a deficient number, since it is larger than the sum of its proper divisors (10075037466899).

16355888122221 is a wasteful number, since it uses less digits than its factorization.

16355888122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168115 (or 168095 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 54.

The spelling of 16355888122221 in words is "sixteen trillion, three hundred fifty-five billion, eight hundred eighty-eight million, one hundred twenty-two thousand, two hundred twenty-one".