21201100222222 has 16 divisors (see below), whose sum is σ = 31817985917760. Its totient is φ = 10595105608192.

The previous prime is 21201100222213. The next prime is 21201100222229. The reversal of 21201100222222 is 22222200110212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201100222222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201100222229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 64174779 + ... + 64504297.

It is an arithmetic number, because the mean of its divisors is an integer number (1988624119860).

Almost surely, 2^{21201100222222} is an apocalyptic number.

21201100222222 is a deficient number, since it is larger than the sum of its proper divisors (10616885695538).

21201100222222 is a wasteful number, since it uses less digits than its factorization.

21201100222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345947.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21201100222222 its reverse (22222200110212), we get a palindrome (43423300332434).

The spelling of 21201100222222 in words is "twenty-one trillion, two hundred one billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-two".