221112121110 has 16 divisors (see below), whose sum is σ = 530669090736. Its totient is φ = 58963232288.

The previous prime is 221112121099. The next prime is 221112121123. The reversal of 221112121110 is 11121211122.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221112121110.

It is a congruent number.

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, 3685201989 + ... + 3685202048.

It is an arithmetic number, because the mean of its divisors is an integer number (33166818171).

Almost surely, 2^221112121110 is an apocalyptic number.

221112121110 is an abundant number, since it is smaller than the sum of its proper divisors (309556969626).

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

221112121110 is a wasteful number, since it uses less digits than its factorization.

221112121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7370404047.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221112121110 its reverse (11121211122), we get a palindrome (232233332232).

It can be divided in two parts, 2 and 21112121110, that added together give a palindrome (21112121112).

The spelling of 221112121110 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred ten".