221563240 has 16 divisors (see below), whose sum is σ = 498517380. Its totient is φ = 88625280.

The previous prime is 221563213. The next prime is 221563241. The reversal of 221563240 is 42365122.

It can be written as a sum of positive squares in 2 ways, for example, as 214153956 + 7409284 = 14634^2 + 2722^2 .

It is not an unprimeable number, because it can be changed into a prime (221563241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2769501 + ... + 2769580.

Almost surely, 2^221563240 is an apocalyptic number.

221563240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221563240 is an abundant number, since it is smaller than the sum of its proper divisors (276954140).

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

221563240 is a wasteful number, since it uses less digits than its factorization.

221563240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5539092 (or 5539088 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 221563240 is about 14885.0005038629. Note that the first 3 decimals coincide. The cubic root of 221563240 is about 605.1075463935.

The spelling of 221563240 in words is "two hundred twenty-one million, five hundred sixty-three thousand, two hundred forty".