221042210 has 8 divisors (see below), whose sum is σ = 397875996. Its totient is φ = 88416880.

The previous prime is 221042203. The next prime is 221042221. The reversal of 221042210 is 12240122.

It can be written as a sum of positive squares in 2 ways, for example, as 214534609 + 6507601 = 14647^2 + 2551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11052101 + ... + 11052120.

Almost surely, 2^221042210 is an apocalyptic number.

221042210 is a deficient number, since it is larger than the sum of its proper divisors (176833786).

221042210 is a wasteful number, since it uses less digits than its factorization.

221042210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22104228.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221042210 is about 14867.4883554688. The cubic root of 221042210 is about 604.6328487466.

Adding to 221042210 its reverse (12240122), we get a palindrome (233282332).

The spelling of 221042210 in words is "two hundred twenty-one million, forty-two thousand, two hundred ten".