221121110110 has 16 divisors (see below), whose sum is σ = 398023560576. Its totient is φ = 88447207968.

The previous prime is 221121110069. The next prime is 221121110123. The reversal of 221121110110 is 11011121122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1027192 + ... + 1223668.

It is an arithmetic number, because the mean of its divisors is an integer number (24876472536).

Almost surely, 2^221121110110 is an apocalyptic number.

221121110110 is a deficient number, since it is larger than the sum of its proper divisors (176902450466).

221121110110 is a wasteful number, since it uses less digits than its factorization.

221121110110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309027.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221121110110 its reverse (11011121122), we get a palindrome (232132231232).

The spelling of 221121110110 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred ten thousand, one hundred ten".