21212222111102 has 8 divisors (see below), whose sum is σ = 34710908909112. Its totient is φ = 9641919141400.

The previous prime is 21212222111099. The next prime is 21212222111117. The reversal of 21212222111102 is 20111122221212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482095957049 + ... + 482095957092.

It is an arithmetic number, because the mean of its divisors is an integer number (4338863613639).

Almost surely, 2^{21212222111102} is an apocalyptic number.

21212222111102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212222111102 is a deficient number, since it is larger than the sum of its proper divisors (13498686798010).

21212222111102 is a wasteful number, since it uses less digits than its factorization.

21212222111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964191914154.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21212222111102 its reverse (20111122221212), we get a palindrome (41323344332314).

It can be divided in two parts, 2121222 and 2111102, that added together give a palindrome (4232324).

The spelling of 21212222111102 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, one hundred two".