217423085307 has 4 divisors (see below), whose sum is σ = 289897447080. Its totient is φ = 144948723536.

The previous prime is 217423085279. The next prime is 217423085357. The reversal of 217423085307 is 703580324712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217423085307 - 2⁸ = 217423085051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217423085357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36237180882 + ... + 36237180887.

It is an arithmetic number, because the mean of its divisors is an integer number (72474361770).

Almost surely, 2^217423085307 is an apocalyptic number.

217423085307 is a deficient number, since it is larger than the sum of its proper divisors (72474361773).

217423085307 is an equidigital number, since it uses as much as digits as its factorization.

217423085307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72474361772.

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 217423085307 in words is "two hundred seventeen billion, four hundred twenty-three million, eighty-five thousand, three hundred seven".