221475280 has 160 divisors (see below), whose sum is σ = 593961984. Its totient is φ = 76167168.

The previous prime is 221475271. The next prime is 221475283. The reversal of 221475280 is 82574122.

It is a happy number.

221475280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221475283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1124142 + ... + 1124338.

Almost surely, 2^221475280 is an apocalyptic number.

221475280 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 221475280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296980992).

221475280 is an abundant number, since it is smaller than the sum of its proper divisors (372486704).

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

221475280 is a wasteful number, since it uses less digits than its factorization.

221475280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 221475280 is about 14882.0455583230. The cubic root of 221475280 is about 605.0274604479.

The spelling of 221475280 in words is "two hundred twenty-one million, four hundred seventy-five thousand, two hundred eighty".