20012221201097 has 2 divisors, whose sum is σ = 20012221201098. Its totient is φ = 20012221201096.

The previous prime is 20012221201001. The next prime is 20012221201171. The reversal of 20012221201097 is 79010212221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10103141959936 + 9909079241161 = 3178544^2 + 3147869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012221201097 - 2¹⁸ = 20012220938953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012221201897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006110600548 + 10006110600549.

It is an arithmetic number, because the mean of its divisors is an integer number (10006110600549).

Almost surely, 2^{20012221201097} is an apocalyptic number.

It is an amenable number.

20012221201097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012221201097 is an equidigital number, since it uses as much as digits as its factorization.

20012221201097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 20012221201097 its reverse (79010212221002), we get a palindrome (99022433422099).

The spelling of 20012221201097 in words is "twenty trillion, twelve billion, two hundred twenty-one million, two hundred one thousand, ninety-seven".