217881923803 has 2 divisors, whose sum is σ = 217881923804. Its totient is φ = 217881923802.

The previous prime is 217881923771. The next prime is 217881923827. The reversal of 217881923803 is 308329188712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217881923803 - 2⁵ = 217881923771 is a prime.

It is not a weakly prime, because it can be changed into another prime (217881923873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108940961901 + 108940961902.

It is an arithmetic number, because the mean of its divisors is an integer number (108940961902).

Almost surely, 2^217881923803 is an apocalyptic number.

217881923803 is a deficient number, since it is larger than the sum of its proper divisors (1).

217881923803 is an equidigital number, since it uses as much as digits as its factorization.

217881923803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 217881923803 in words is "two hundred seventeen billion, eight hundred eighty-one million, nine hundred twenty-three thousand, eight hundred three".