221201110110 has 128 divisors (see below), whose sum is σ = 584672256000. Its totient is φ = 53310483072.

The previous prime is 221201110069. The next prime is 221201110121. The reversal of 221201110110 is 11011102122.

It is a super-2 number, since 2×221201110110² (a number of 23 digits) contains 22 as substring.

It is a congruent 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 63 ways as a sum of consecutive naturals, for example, 4946431 + ... + 4990949.

It is an arithmetic number, because the mean of its divisors is an integer number (4567752000).

Almost surely, 2^221201110110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221201110110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292336128000).

221201110110 is an abundant number, since it is smaller than the sum of its proper divisors (363471145890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221201110110 is a wasteful number, since it uses less digits than its factorization.

221201110110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44950.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221201110110 its reverse (11011102122), we get a palindrome (232212212232).

The spelling of 221201110110 in words is "two hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred ten".