21740171870713 has 2 divisors, whose sum is σ = 21740171870714. Its totient is φ = 21740171870712.

The previous prime is 21740171870699. The next prime is 21740171870731. The reversal of 21740171870713 is 31707817104712.

It is a happy number.

Together with next prime (21740171870731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15556808300944 + 6183363569769 = 3944212^2 + 2486637^2 .

It is a cyclic number.

It is not a de Polignac number, because 21740171870713 - 2⁹ = 21740171870201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21740171850713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870085935356 + 10870085935357.

It is an arithmetic number, because the mean of its divisors is an integer number (10870085935357).

Almost surely, 2^{21740171870713} is an apocalyptic number.

It is an amenable number.

21740171870713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21740171870713 is an equidigital number, since it uses as much as digits as its factorization.

21740171870713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460992, while the sum is 49.

The spelling of 21740171870713 in words is "twenty-one trillion, seven hundred forty billion, one hundred seventy-one million, eight hundred seventy thousand, seven hundred thirteen".