221111212110 has 32 divisors (see below), whose sum is σ = 530956864512. Its totient is φ = 58930772640.

The previous prime is 221111212099. The next prime is 221111212129. The reversal of 221111212110 is 11212111122.

It is a happy number.

221111212110 is digitally balanced in base 2, 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 221111212110.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1957734 + ... + 2067593.

It is an arithmetic number, because the mean of its divisors is an integer number (16592402016).

Almost surely, 2^221111212110 is an apocalyptic number.

221111212110 is an abundant number, since it is smaller than the sum of its proper divisors (309845652402).

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

221111212110 is a wasteful number, since it uses less digits than its factorization.

221111212110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027168.

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

Adding to 221111212110 its reverse (11212111122), we get a palindrome (232323323232).

It can be divided in two parts, 2211112 and 12110, that added together give a palindrome (2223222).

The spelling of 221111212110 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, one hundred ten".