21002222101117 has 2 divisors, whose sum is σ = 21002222101118. Its totient is φ = 21002222101116.

The previous prime is 21002222101067. The next prime is 21002222101193. The reversal of 21002222101117 is 71110122220012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13707328880281 + 7294893220836 = 3702341^2 + 2700906^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002222101117 - 2³⁹ = 20452466287229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002222102117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501111050558 + 10501111050559.

It is an arithmetic number, because the mean of its divisors is an integer number (10501111050559).

Almost surely, 2^{21002222101117} is an apocalyptic number.

It is an amenable number.

21002222101117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002222101117 is an equidigital number, since it uses as much as digits as its factorization.

21002222101117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21002222101117 its reverse (71110122220012), we get a palindrome (92112344321129).

The spelling of 21002222101117 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred one thousand, one hundred seventeen".