20121102021222 has 128 divisors (see below), whose sum is σ = 47316821760000. Its totient is φ = 6320383001856.

The previous prime is 20121102021161. The next prime is 20121102021227. The reversal of 20121102021222 is 22212020112102.

It is a happy number.

20121102021222 is a `hidden beast` number, since 201 + 211 + 0 + 20 + 212 + 22 = 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 = 20121102021195 and 20121102021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121102021227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 146406154 + ... + 146543522.

It is an arithmetic number, because the mean of its divisors is an integer number (369662670000).

Almost surely, 2^{20121102021222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121102021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23658410880000).

20121102021222 is an abundant number, since it is smaller than the sum of its proper divisors (27195719738778).

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

20121102021222 is a wasteful number, since it uses less digits than its factorization.

20121102021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138155 (or 138149 counting only the distinct ones).

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

Adding to 20121102021222 its reverse (22212020112102), we get a palindrome (42333122133324).

The spelling of 20121102021222 in words is "twenty trillion, one hundred twenty-one billion, one hundred two million, twenty-one thousand, two hundred twenty-two".