221099570 has 16 divisors (see below), whose sum is σ = 405489240. Its totient is φ = 86770944.

The previous prime is 221099539. The next prime is 221099579. The reversal of 221099570 is 75990122.

It can be written as a sum of positive squares in 4 ways, for example, as 219247249 + 1852321 = 14807^2 + 1361^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221099570.

It is not an unprimeable number, because it can be changed into a prime (221099579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208055 + ... + 209114.

Almost surely, 2^221099570 is an apocalyptic number.

221099570 is a deficient number, since it is larger than the sum of its proper divisors (184389670).

221099570 is a wasteful number, since it uses less digits than its factorization.

221099570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417229.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 221099570 is about 14869.4172717023. The cubic root of 221099570 is about 604.6851445512.

The spelling of 221099570 in words is "two hundred twenty-one million, ninety-nine thousand, five hundred seventy".