21425877246617 has 2 divisors, whose sum is σ = 21425877246618. Its totient is φ = 21425877246616.

The previous prime is 21425877246593. The next prime is 21425877246623. The reversal of 21425877246617 is 71664277852412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21422188384921 + 3688861696 = 4628411^2 + 60736^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425877246617 - 2²⁸ = 21425608811161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425877246617.

It is not a weakly prime, because it can be changed into another prime (21425877246017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712938623308 + 10712938623309.

It is an arithmetic number, because the mean of its divisors is an integer number (10712938623309).

Almost surely, 2^{21425877246617} is an apocalyptic number.

It is an amenable number.

21425877246617 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425877246617 is an equidigital number, since it uses as much as digits as its factorization.

21425877246617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63221760, while the sum is 62.

The spelling of 21425877246617 in words is "twenty-one trillion, four hundred twenty-five billion, eight hundred seventy-seven million, two hundred forty-six thousand, six hundred seventeen".