221736960 has 208 divisors, whose sum is σ = 790267680. Its totient is φ = 58982400.

The previous prime is 221736953. The next prime is 221736961. The reversal of 221736960 is 69637122.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221736961) 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 15 ways as a sum of consecutive naturals, for example, 552760 + ... + 553160.

Almost surely, 2^221736960 is an apocalyptic number.

221736960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221736960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395133840).

221736960 is an abundant number, since it is smaller than the sum of its proper divisors (568530720).

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

221736960 is an equidigital number, since it uses as much as digits as its factorization.

221736960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 221736960 is about 14890.8347650493. The cubic root of 221736960 is about 605.2656529781.

The spelling of 221736960 in words is "two hundred twenty-one million, seven hundred thirty-six thousand, nine hundred sixty".