221220211110 has 16 divisors (see below), whose sum is σ = 530928506736. Its totient is φ = 58992056288.

The previous prime is 221220211063. The next prime is 221220211153. The reversal of 221220211110 is 11112022122.

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 221220211110.

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, 3687003489 + ... + 3687003548.

It is an arithmetic number, because the mean of its divisors is an integer number (33183031671).

Almost surely, 2^221220211110 is an apocalyptic number.

221220211110 is an abundant number, since it is smaller than the sum of its proper divisors (309708295626).

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

221220211110 is a wasteful number, since it uses less digits than its factorization.

221220211110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374007047.

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

Adding to 221220211110 its reverse (11112022122), we get a palindrome (232332233232).

The spelling of 221220211110 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, one hundred ten".