20012122211021 has 2 divisors, whose sum is σ = 20012122211022. Its totient is φ = 20012122211020.

The previous prime is 20012122211017. The next prime is 20012122211027. The reversal of 20012122211021 is 12011222121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19230066744100 + 782055466921 = 4385210^2 + 884339^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012122211021 - 2² = 20012122211017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012122211027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006061105510 + 10006061105511.

It is an arithmetic number, because the mean of its divisors is an integer number (10006061105511).

Almost surely, 2^{20012122211021} is an apocalyptic number.

It is an amenable number.

20012122211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012122211021 is an equidigital number, since it uses as much as digits as its factorization.

20012122211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20012122211021 its reverse (12011222121002), we get a palindrome (32023344332023).

The spelling of 20012122211021 in words is "twenty trillion, twelve billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".