20121120222210 has 192 divisors, whose sum is σ = 61379619485184. Its totient is φ = 4477203993600.

The previous prime is 20121120222209. The next prime is 20121120222227. The reversal of 20121120222210 is 1222202112102.

It is a happy number.

20121120222210 is a `hidden beast` number, since 2 + 0 + 1 + 211 + 20 + 222 + 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 95 ways as a sum of consecutive naturals, for example, 11062747 + ... + 12752513.

It is an arithmetic number, because the mean of its divisors is an integer number (319685518152).

Almost surely, 2^{20121120222210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121120222210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30689809742592).

20121120222210 is an abundant number, since it is smaller than the sum of its proper divisors (41258499262974).

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

20121120222210 is a wasteful number, since it uses less digits than its factorization.

20121120222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690289 (or 1690286 counting only the distinct ones).

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

Adding to 20121120222210 its reverse (1222202112102), we get a palindrome (21343322334312).

The spelling of 20121120222210 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, two hundred ten".