20101112121222 has 192 divisors, whose sum is σ = 50592623328000. Its totient is φ = 5703939440640.

The previous prime is 20101112121221. The next prime is 20101112121229. The reversal of 20101112121222 is 22212121110102.

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 = 20101112121195 and 20101112121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101112121221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 180682158 + ... + 180793374.

It is an arithmetic number, because the mean of its divisors is an integer number (263503246500).

Almost surely, 2^{20101112121222} is an apocalyptic number.

20101112121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101112121222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25296311664000).

20101112121222 is an abundant number, since it is smaller than the sum of its proper divisors (30491511206778).

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

20101112121222 is a wasteful number, since it uses less digits than its factorization.

20101112121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111811 (or 111808 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20101112121222 its reverse (22212121110102), we get a palindrome (42313233231324).

The spelling of 20101112121222 in words is "twenty trillion, one hundred one billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".