221822266 has 4 divisors (see below), whose sum is σ = 332733402. Its totient is φ = 110911132.

The previous prime is 221822261. The next prime is 221822297. The reversal of 221822266 is 662228122.

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., 220077225 + 1745041 = 14835^2 + 1321^2 .

It is not an unprimeable number, because it can be changed into a prime (221822261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55455565 + ... + 55455568.

Almost surely, 2^221822266 is an apocalyptic number.

221822266 is a deficient number, since it is larger than the sum of its proper divisors (110911136).

221822266 is a wasteful number, since it uses less digits than its factorization.

221822266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110911135.

The product of its digits is 9216, while the sum is 31.

The square root of 221822266 is about 14893.6988689848. The cubic root of 221822266 is about 605.3432617086.

The spelling of 221822266 in words is "two hundred twenty-one million, eight hundred twenty-two thousand, two hundred sixty-six".