221708543136 has 96 divisors (see below), whose sum is σ = 617612361408. Its totient is φ = 69398384640.

The previous prime is 221708543131. The next prime is 221708543143. The reversal of 221708543136 is 631345807122.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (221708543131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569646 + ... + 876306.

It is an arithmetic number, because the mean of its divisors is an integer number (6433462098).

Almost surely, 2^221708543136 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 221708543136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308806180704).

221708543136 is an abundant number, since it is smaller than the sum of its proper divisors (395903818272).

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

221708543136 is a wasteful number, since it uses less digits than its factorization.

221708543136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307134 (or 307126 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 221708543136 in words is "two hundred twenty-one billion, seven hundred eight million, five hundred forty-three thousand, one hundred thirty-six".