21002222102117 has 2 divisors, whose sum is σ = 21002222102118. Its totient is φ = 21002222102116.

The previous prime is 21002222102093. The next prime is 21002222102137. The reversal of 21002222102117 is 71120122220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19977914151556 + 1024307950561 = 4469666^2 + 1012081^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002222102117 - 2²² = 21002217907813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002222102092 and 21002222102101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002222102137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501111051058 + 10501111051059.

It is an arithmetic number, because the mean of its divisors is an integer number (10501111051059).

Almost surely, 2^{21002222102117} is an apocalyptic number.

It is an amenable number.

21002222102117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002222102117 is an equidigital number, since it uses as much as digits as its factorization.

21002222102117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21002222102117 its reverse (71120122220012), we get a palindrome (92122344322129).

The spelling of 21002222102117 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred two thousand, one hundred seventeen".