221442434 has 16 divisors (see below), whose sum is σ = 348331320. Its totient is φ = 105436800.

The previous prime is 221442433. The next prime is 221442443. The reversal of 221442434 is 434244122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 218892025 + 2550409 = 14795^2 + 1597^2 .

It is not an unprimeable number, because it can be changed into a prime (221442433) 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 7 ways as a sum of consecutive naturals, for example, 21917 + ... + 30384.

Almost surely, 2^221442434 is an apocalyptic number.

221442434 is a deficient number, since it is larger than the sum of its proper divisors (126888886).

221442434 is a wasteful number, since it uses less digits than its factorization.

221442434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52405.

The product of its digits is 6144, while the sum is 26.

The square root of 221442434 is about 14880.9419728726. The cubic root of 221442434 is about 604.9975493378.

Adding to 221442434 its reverse (434244122), we get a palindrome (655686556).

The spelling of 221442434 in words is "two hundred twenty-one million, four hundred forty-two thousand, four hundred thirty-four".