221100101210 has 16 divisors (see below), whose sum is σ = 398079724392. Its totient is φ = 88417920000.

The previous prime is 221100101197. The next prime is 221100101221. The reversal of 221100101210 is 12101001122.

It can be written as a sum of positive squares in 4 ways, for example, as 47150213881 + 173949887329 = 217141^2 + 417073^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221100101191 and 221100101200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723051 + ... + 2803070.

Almost surely, 2^221100101210 is an apocalyptic number.

221100101210 is a deficient number, since it is larger than the sum of its proper divisors (176979623182).

221100101210 is a wasteful number, since it uses less digits than its factorization.

221100101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530129.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221100101210 its reverse (12101001122), we get a palindrome (233201102332).

The spelling of 221100101210 in words is "two hundred twenty-one billion, one hundred million, one hundred one thousand, two hundred ten".