221043434 has 4 divisors (see below), whose sum is σ = 331565154. Its totient is φ = 110521716.

The previous prime is 221043421. The next prime is 221043451. The reversal of 221043434 is 434340122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434340122 = 2 ⋅217170061.

It can be written as a sum of positive squares in only one way, i.e., 201214225 + 19829209 = 14185^2 + 4453^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55260857 + ... + 55260860.

Almost surely, 2^221043434 is an apocalyptic number.

221043434 is a deficient number, since it is larger than the sum of its proper divisors (110521720).

221043434 is a wasteful number, since it uses less digits than its factorization.

221043434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110521719.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 221043434 is about 14867.5295190559. The cubic root of 221043434 is about 604.6339647766.

Adding to 221043434 its reverse (434340122), we get a palindrome (655383556).

The spelling of 221043434 in words is "two hundred twenty-one million, forty-three thousand, four hundred thirty-four".