21517602341273 has 2 divisors, whose sum is σ = 21517602341274. Its totient is φ = 21517602341272.

The previous prime is 21517602341251. The next prime is 21517602341303. The reversal of 21517602341273 is 37214320671512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20845141659904 + 672460681369 = 4565648^2 + 820037^2 .

It is a cyclic number.

It is not a de Polignac number, because 21517602341273 - 2⁴⁰ = 20418090713497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21517602341173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10758801170636 + 10758801170637.

It is an arithmetic number, because the mean of its divisors is an integer number (10758801170637).

Almost surely, 2^{21517602341273} is an apocalyptic number.

It is an amenable number.

21517602341273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21517602341273 is an equidigital number, since it uses as much as digits as its factorization.

21517602341273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 21517602341273 in words is "twenty-one trillion, five hundred seventeen billion, six hundred two million, three hundred forty-one thousand, two hundred seventy-three".