221443426 has 4 divisors (see below), whose sum is σ = 332165142. Its totient is φ = 110721712.

The previous prime is 221443403. The next prime is 221443427. The reversal of 221443426 is 624344122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 220492801 + 950625 = 14849^2 + 975^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221443394 and 221443403.

It is not an unprimeable number, because it can be changed into a prime (221443427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55360855 + ... + 55360858.

Almost surely, 2^221443426 is an apocalyptic number.

221443426 is a deficient number, since it is larger than the sum of its proper divisors (110721716).

221443426 is a wasteful number, since it uses less digits than its factorization.

221443426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110721715.

The product of its digits is 9216, while the sum is 28.

The square root of 221443426 is about 14880.9753040585. The cubic root of 221443426 is about 604.9984527429.

Adding to 221443426 its reverse (624344122), we get a palindrome (845787548).

It can be divided in two parts, 2214434 and 26, that added together give a triangular number (2214460 = T₂₁₀₄).

The spelling of 221443426 in words is "two hundred twenty-one million, four hundred forty-three thousand, four hundred twenty-six".