20120122212210 has 144 divisors (see below), whose sum is σ = 54768723609600. Its totient is φ = 5124293461056.

The previous prime is 20120122212209. The next prime is 20120122212241. The reversal of 20120122212210 is 1221222102102.

It is a happy number.

20120122212210 is a `hidden beast` number, since 2 + 0 + 120 + 122 + 212 + 210 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 31054351 + ... + 31695629.

It is an arithmetic number, because the mean of its divisors is an integer number (380338358400).

Almost surely, 2^{20120122212210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20120122212210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27384361804800).

20120122212210 is an abundant number, since it is smaller than the sum of its proper divisors (34648601397390).

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

20120122212210 is a wasteful number, since it uses less digits than its factorization.

20120122212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641997 (or 641971 counting only the distinct ones).

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

Adding to 20120122212210 its reverse (1221222102102), we get a palindrome (21341344314312).

The spelling of 20120122212210 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, two hundred ten".