21117703860349 has 2 divisors, whose sum is σ = 21117703860350. Its totient is φ = 21117703860348.

The previous prime is 21117703860289. The next prime is 21117703860373. The reversal of 21117703860349 is 94306830771112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18338581475449 + 2779122384900 = 4282357^2 + 1667070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21117703860349 - 2¹⁷ = 21117703729277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21117703860296 and 21117703860305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21117703866349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558851930174 + 10558851930175.

It is an arithmetic number, because the mean of its divisors is an integer number (10558851930175).

Almost surely, 2^{21117703860349} is an apocalyptic number.

It is an amenable number.

21117703860349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21117703860349 is an equidigital number, since it uses as much as digits as its factorization.

21117703860349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 21117703860349 in words is "twenty-one trillion, one hundred seventeen billion, seven hundred three million, eight hundred sixty thousand, three hundred forty-nine".