21112021111222 has 16 divisors (see below), whose sum is σ = 32047782194160. Its totient is φ = 10430178284448.

The previous prime is 21112021111213. The next prime is 21112021111241. The reversal of 21112021111222 is 22211112021112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112021111222.

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, 187753113 + ... + 187865524.

It is an arithmetic number, because the mean of its divisors is an integer number (2002986387135).

Almost surely, 2^{21112021111222} is an apocalyptic number.

21112021111222 is a deficient number, since it is larger than the sum of its proper divisors (10935761082938).

21112021111222 is a wasteful number, since it uses less digits than its factorization.

21112021111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375618975.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112021111222 its reverse (22211112021112), we get a palindrome (43323133132334).

The spelling of 21112021111222 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, one hundred eleven thousand, two hundred twenty-two".