221100111102210 has 32 divisors (see below), whose sum is σ = 530657105550912. Its totient is φ = 58958158637760.

The previous prime is 221100111102191. The next prime is 221100111102223. The reversal of 221100111102210 is 12201111001122.

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 221100111102210.

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, 115975576 + ... + 117866595.

It is an arithmetic number, because the mean of its divisors is an integer number (16583034548466).

Almost surely, 2^{221100111102210} is an apocalyptic number.

221100111102210 is an abundant number, since it is smaller than the sum of its proper divisors (309556994448702).

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

221100111102210 is a wasteful number, since it uses less digits than its factorization.

221100111102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233873698.

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

Adding to 221100111102210 its reverse (12201111001122), we get a palindrome (233301222103332).

The spelling of 221100111102210 in words is "two hundred twenty-one trillion, one hundred billion, one hundred eleven million, one hundred two thousand, two hundred ten".