20122222021021 has 2 divisors, whose sum is σ = 20122222021022. Its totient is φ = 20122222021020.

The previous prime is 20122222021019. The next prime is 20122222021037. The reversal of 20122222021021 is 12012022222102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19542013803225 + 580208217796 = 4420635^2 + 761714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122222021021 - 2¹ = 20122222021019 is a prime.

Together with 20122222021019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20122222021021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122222021001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061111010510 + 10061111010511.

It is an arithmetic number, because the mean of its divisors is an integer number (10061111010511).

Almost surely, 2^{20122222021021} is an apocalyptic number.

It is an amenable number.

20122222021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122222021021 is an equidigital number, since it uses as much as digits as its factorization.

20122222021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20122222021021 its reverse (12012022222102), we get a palindrome (32134244243123).

The spelling of 20122222021021 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty-two million, twenty-one thousand, twenty-one".