21717570678803 has 2 divisors, whose sum is σ = 21717570678804. Its totient is φ = 21717570678802.

The previous prime is 21717570678757. The next prime is 21717570678901. The reversal of 21717570678803 is 30887607571712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21717570678803 is a prime.

It is not a weakly prime, because it can be changed into another prime (21717570678103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10858785339401 + 10858785339402.

It is an arithmetic number, because the mean of its divisors is an integer number (10858785339402).

Almost surely, 2^{21717570678803} is an apocalyptic number.

21717570678803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21717570678803 is an equidigital number, since it uses as much as digits as its factorization.

21717570678803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27659520, while the sum is 62.

The spelling of 21717570678803 in words is "twenty-one trillion, seven hundred seventeen billion, five hundred seventy million, six hundred seventy-eight thousand, eight hundred three".