221121220110 has 64 divisors (see below), whose sum is σ = 616783680000. Its totient is φ = 49685346432.

The previous prime is 221121220109. The next prime is 221121220147. The reversal of 221121220110 is 11022121122.

221121220110 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 221121220110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8910985 + ... + 8935764.

It is an arithmetic number, because the mean of its divisors is an integer number (9637245000).

Almost surely, 2^221121220110 is an apocalyptic number.

221121220110 is an abundant number, since it is smaller than the sum of its proper divisors (395662459890).

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

221121220110 is a wasteful number, since it uses less digits than its factorization.

221121220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17846825.

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

Adding to 221121220110 its reverse (11022121122), we get a palindrome (232143341232).

It can be divided in two parts, 2211212 and 20110, that added together give a palindrome (2231322).

The spelling of 221121220110 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred ten".