20122222122 has 128 divisors (see below), whose sum is σ = 46531584000. Its totient is φ = 6441422400.

The previous prime is 20122222111. The next prime is 20122222123. The reversal of 20122222122 is 22122222102.

20122222122 is a `hidden beast` number, since 201 + 222 + 221 + 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 = 20122222095 and 20122222104.

It is not an unprimeable number, because it can be changed into a prime (20122222123) 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, 56050579 + ... + 56050937.

It is an arithmetic number, because the mean of its divisors is an integer number (363528000).

Almost surely, 2^20122222122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20122222122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23265792000).

20122222122 is an abundant number, since it is smaller than the sum of its proper divisors (26409361878).

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

20122222122 is a wasteful number, since it uses less digits than its factorization.

20122222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20122222122 its reverse (22122222102), we get a palindrome (42244444224).

The spelling of 20122222122 in words is "twenty billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-two".