221303221536 has 48 divisors (see below), whose sum is σ = 581740488000. Its totient is φ = 73663673088.

The previous prime is 221303221471. The next prime is 221303221541. The reversal of 221303221536 is 635122303122.

It is a tau number, because it is divible by the number of its divisors (48).

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 7 ways as a sum of consecutive naturals, for example, 1557636 + ... + 1693763.

It is an arithmetic number, because the mean of its divisors is an integer number (12119593500).

Almost surely, 2^221303221536 is an apocalyptic number.

It is an amenable number.

221303221536 is an abundant number, since it is smaller than the sum of its proper divisors (360437266464).

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

221303221536 is a wasteful number, since it uses less digits than its factorization.

221303221536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252121 (or 3252113 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 221303221536 its reverse (635122303122), we get a palindrome (856425524658).

The spelling of 221303221536 in words is "two hundred twenty-one billion, three hundred three million, two hundred twenty-one thousand, five hundred thirty-six".