221288712 has 32 divisors (see below), whose sum is σ = 568176000. Its totient is φ = 71769024.

The previous prime is 221288701. The next prime is 221288713. The reversal of 221288712 is 217882122.

It is not an unprimeable number, because it can be changed into a prime (221288713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123712 + ... + 125487.

It is an arithmetic number, because the mean of its divisors is an integer number (17755500).

Almost surely, 2^221288712 is an apocalyptic number.

It is an amenable number.

221288712 is an abundant number, since it is smaller than the sum of its proper divisors (346887288).

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

221288712 is a wasteful number, since it uses less digits than its factorization.

221288712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249245 (or 249241 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 221288712 is about 14875.7760133715. The cubic root of 221288712 is about 604.8575235382.

The spelling of 221288712 in words is "two hundred twenty-one million, two hundred eighty-eight thousand, seven hundred twelve".