221061568 has 56 divisors (see below), whose sum is σ = 539914592. Its totient is φ = 87450624.

The previous prime is 221061563. The next prime is 221061601. The reversal of 221061568 is 865160122.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221061563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13155 + ... + 24802.

It is an arithmetic number, because the mean of its divisors is an integer number (9641332).

Almost surely, 2^221061568 is an apocalyptic number.

221061568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221061568 is an abundant number, since it is smaller than the sum of its proper divisors (318853024).

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

221061568 is a wasteful number, since it uses less digits than its factorization.

221061568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37989 (or 37979 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 221061568 is about 14868.1393590456. The cubic root of 221061568 is about 604.6504986802.

The spelling of 221061568 in words is "two hundred twenty-one million, sixty-one thousand, five hundred sixty-eight".