221604547896 has 192 divisors, whose sum is σ = 636445555200. Its totient is φ = 72220750848.

The previous prime is 221604547877. The next prime is 221604547903. The reversal of 221604547896 is 698745406122.

221604547896 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 0 + 4 + 547 + 8 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 15644065 + ... + 15658223.

It is an arithmetic number, because the mean of its divisors is an integer number (3314820600).

Almost surely, 2^221604547896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221604547896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318222777600).

221604547896 is an abundant number, since it is smaller than the sum of its proper divisors (414841007304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221604547896 is a wasteful number, since it uses less digits than its factorization.

221604547896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14360 (or 14344 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 221604547896 in words is "two hundred twenty-one billion, six hundred four million, five hundred forty-seven thousand, eight hundred ninety-six".