20021221120122 has 48 divisors (see below), whose sum is σ = 43803119355840. Its totient is φ = 6608547144576.

The previous prime is 20021221120097. The next prime is 20021221120177. The reversal of 20021221120122 is 22102112212002.

It is a happy number.

20021221120122 is a `hidden beast` number, since 20 + 0 + 212 + 211 + 201 + 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 = 20021221120095 and 20021221120104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31161058 + ... + 31797074.

It is an arithmetic number, because the mean of its divisors is an integer number (912564986580).

Almost surely, 2^{20021221120122} is an apocalyptic number.

20021221120122 is an abundant number, since it is smaller than the sum of its proper divisors (23781898235718).

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

20021221120122 is a wasteful number, since it uses less digits than its factorization.

20021221120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653107 (or 653104 counting only the distinct ones).

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

Adding to 20021221120122 its reverse (22102112212002), we get a palindrome (42123333332124).

The spelling of 20021221120122 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-two".