221101010 has 24 divisors (see below), whose sum is σ = 430954020. Its totient is φ = 81636672.

The previous prime is 221101007. The next prime is 221101039. The reversal of 221101010 is 10101122.

It can be written as a sum of positive squares in 6 ways, for example, as 2859481 + 218241529 = 1691^2 + 14773^2 .

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 63725 + ... + 67104.

Almost surely, 2^221101010 is an apocalyptic number.

221101010 is a deficient number, since it is larger than the sum of its proper divisors (209853010).

221101010 is a wasteful number, since it uses less digits than its factorization.

221101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130862 (or 130849 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 221101010 is about 14869.4656931579. The cubic root of 221101010 is about 604.6864573002.

Adding to 221101010 its reverse (10101122), we get a palindrome (231202132).

The spelling of 221101010 in words is "two hundred twenty-one million, one hundred one thousand, ten".