221221102110 has 32 divisors (see below), whose sum is σ = 530992042272. Its totient is φ = 58985472000.

The previous prime is 221221102103. The next prime is 221221102183. The reversal of 221221102110 is 11201122122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221221102110.

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 15 ways as a sum of consecutive naturals, for example, 159891 + ... + 684110.

It is an arithmetic number, because the mean of its divisors is an integer number (16593501321).

Almost surely, 2^221221102110 is an apocalyptic number.

221221102110 is an abundant number, since it is smaller than the sum of its proper divisors (309770940162).

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

221221102110 is a wasteful number, since it uses less digits than its factorization.

221221102110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852748.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221102110 its reverse (11201122122), we get a palindrome (232422224232).

The spelling of 221221102110 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred ten".