20002222122121 has 2 divisors, whose sum is σ = 20002222122122. Its totient is φ = 20002222122120.

The previous prime is 20002222122107. The next prime is 20002222122187. The reversal of 20002222122121 is 12122122220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19886069984400 + 116152137721 = 4459380^2 + 340811^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002222122121 - 2²⁵ = 20002188567689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20002222162121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001111061060 + 10001111061061.

It is an arithmetic number, because the mean of its divisors is an integer number (10001111061061).

Almost surely, 2^{20002222122121} is an apocalyptic number.

It is an amenable number.

20002222122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002222122121 is an equidigital number, since it uses as much as digits as its factorization.

20002222122121 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 20002222122121 its reverse (12122122220002), we get a palindrome (32124344342123).

The spelling of 20002222122121 in words is "twenty trillion, two billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".