221522160 has 80 divisors (see below), whose sum is σ = 690955776. Its totient is φ = 58708224.

The previous prime is 221522153. The next prime is 221522183. The reversal of 221522160 is 61225122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37317 + ... + 42843.

Almost surely, 2^221522160 is an apocalyptic number.

221522160 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 221522160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345477888).

221522160 is an abundant number, since it is smaller than the sum of its proper divisors (469433616).

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

221522160 is a wasteful number, since it uses less digits than its factorization.

221522160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710 (or 5704 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 221522160 is about 14883.6205272776. The cubic root of 221522160 is about 605.0701464553.

Adding to 221522160 its reverse (61225122), we get a palindrome (282747282).

The spelling of 221522160 in words is "two hundred twenty-one million, five hundred twenty-two thousand, one hundred sixty".