221340442 has 16 divisors (see below), whose sum is σ = 351893160. Its totient is φ = 104055808.

The previous prime is 221340439. The next prime is 221340491. The reversal of 221340442 is 244043122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 206525641 + 14814801 = 14371^2 + 3849^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39138 + ... + 44434.

Almost surely, 2^221340442 is an apocalyptic number.

221340442 is a deficient number, since it is larger than the sum of its proper divisors (130552718).

221340442 is a wasteful number, since it uses less digits than its factorization.

221340442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6545.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 221340442 is about 14877.5146445903. The cubic root of 221340442 is about 604.9046517771.

Adding to 221340442 its reverse (244043122), we get a palindrome (465383564).

The spelling of 221340442 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred forty-two".