21100122220222 has 8 divisors (see below), whose sum is σ = 31701814952616. Its totient is φ = 10532850569352.

The previous prime is 21100122220159. The next prime is 21100122220297. The reversal of 21100122220222 is 22202222100112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21100122220222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8605268848 + ... + 8605271299.

It is an arithmetic number, because the mean of its divisors is an integer number (3962726869077).

Almost surely, 2^{21100122220222} is an apocalyptic number.

21100122220222 is a deficient number, since it is larger than the sum of its proper divisors (10601692732394).

21100122220222 is a wasteful number, since it uses less digits than its factorization.

21100122220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17210540762.

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

Adding to 21100122220222 its reverse (22202222100112), we get a palindrome (43302344320334).

The spelling of 21100122220222 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twenty-two".