21002222022217 has 2 divisors, whose sum is σ = 21002222022218. Its totient is φ = 21002222022216.

The previous prime is 21002222022209. The next prime is 21002222022247. The reversal of 21002222022217 is 71222022220012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13846912668736 + 7155309353481 = 3721144^2 + 2674941^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002222022217 - 2³ = 21002222022209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002222022191 and 21002222022200.

It is not a weakly prime, because it can be changed into another prime (21002222022247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501111011108 + 10501111011109.

It is an arithmetic number, because the mean of its divisors is an integer number (10501111011109).

Almost surely, 2^{21002222022217} is an apocalyptic number.

It is an amenable number.

21002222022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002222022217 is an equidigital number, since it uses as much as digits as its factorization.

21002222022217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

Adding to 21002222022217 its reverse (71222022220012), we get a palindrome (92224244242229).

The spelling of 21002222022217 in words is "twenty-one trillion, two billion, two hundred twenty-two million, twenty-two thousand, two hundred seventeen".