217423337971 has 24 divisors (see below), whose sum is σ = 259318692864. Its totient is φ = 181666069200.

The previous prime is 217423337933. The next prime is 217423337977. The reversal of 217423337971 is 179733324712.

It is not a de Polignac number, because 217423337971 - 2¹¹ = 217423335923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (217423337977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 957246 + ... + 1162396.

It is an arithmetic number, because the mean of its divisors is an integer number (10804945536).

Almost surely, 2^217423337971 is an apocalyptic number.

217423337971 is a deficient number, since it is larger than the sum of its proper divisors (41895354893).

217423337971 is a wasteful number, since it uses less digits than its factorization.

217423337971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205711 (or 205704 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 49.

The spelling of 217423337971 in words is "two hundred seventeen billion, four hundred twenty-three million, three hundred thirty-seven thousand, nine hundred seventy-one".