20101221102222 has 96 divisors (see below), whose sum is σ = 48290628072960. Its totient is φ = 6002821094400.

The previous prime is 20101221102197. The next prime is 20101221102227. The reversal of 20101221102222 is 22220112210102.

It is a happy number.

20101221102222 is a `hidden beast` number, since 20 + 101 + 221 + 102 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20101221102195 and 20101221102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101221102227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 576979 + ... + 6366737.

It is an arithmetic number, because the mean of its divisors is an integer number (503027375760).

Almost surely, 2^{20101221102222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101221102222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24145314036480).

20101221102222 is an abundant number, since it is smaller than the sum of its proper divisors (28189406970738).

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

20101221102222 is a wasteful number, since it uses less digits than its factorization.

20101221102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790218 (or 5790215 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20101221102222 its reverse (22220112210102), we get a palindrome (42321333312324).

The spelling of 20101221102222 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty-two".