221766970 has 16 divisors (see below), whose sum is σ = 401491080. Its totient is φ = 88193344.

The previous prime is 221766967. The next prime is 221766977. The reversal of 221766970 is 79667122.

It can be written as a sum of positive squares in 4 ways, for example, as 216472369 + 5294601 = 14713^2 + 2301^2 .

It is not an unprimeable number, because it can be changed into a prime (221766977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62365 + ... + 65824.

Almost surely, 2^221766970 is an apocalyptic number.

221766970 is a deficient number, since it is larger than the sum of its proper divisors (179724110).

221766970 is a wasteful number, since it uses less digits than its factorization.

221766970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128369.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 221766970 is about 14891.8423977693. The cubic root of 221766970 is about 605.2929574066.

The spelling of 221766970 in words is "two hundred twenty-one million, seven hundred sixty-six thousand, nine hundred seventy".