20021002122 has 64 divisors (see below), whose sum is σ = 44190203904. Its totient is φ = 5996773440.

The previous prime is 20021002117. The next prime is 20021002159. The reversal of 20021002122 is 22120012002.

It is a junction number, because it is equal to n+sod(n) for n = 20021002098 and 20021002107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2317503 + ... + 2326125.

It is an arithmetic number, because the mean of its divisors is an integer number (690471936).

Almost surely, 2^20021002122 is an apocalyptic number.

20021002122 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 20021002122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22095101952).

20021002122 is an abundant number, since it is smaller than the sum of its proper divisors (24169201782).

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

20021002122 is a wasteful number, since it uses less digits than its factorization.

20021002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20021002122 its reverse (22120012002), we get a palindrome (42141014124).

The spelling of 20021002122 in words is "twenty billion, twenty-one million, two thousand, one hundred twenty-two".