20002223021897 has 2 divisors, whose sum is σ = 20002223021898. Its totient is φ = 20002223021896.

The previous prime is 20002223021827. The next prime is 20002223022007. The reversal of 20002223021897 is 79812032220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18216942233161 + 1785280788736 = 4268131^2 + 1336144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002223021897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20002223021897.

It is not a weakly prime, because it can be changed into another prime (20002223021827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001111510948 + 10001111510949.

It is an arithmetic number, because the mean of its divisors is an integer number (10001111510949).

Almost surely, 2^{20002223021897} is an apocalyptic number.

It is an amenable number.

20002223021897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002223021897 is an equidigital number, since it uses as much as digits as its factorization.

20002223021897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

Adding to 20002223021897 its reverse (79812032220002), we get a palindrome (99814255241899).

The spelling of 20002223021897 in words is "twenty trillion, two billion, two hundred twenty-three million, twenty-one thousand, eight hundred ninety-seven".