217422671 has 4 divisors (see below), whose sum is σ = 217474344. Its totient is φ = 217371000.

The previous prime is 217422637. The next prime is 217422679. The reversal of 217422671 is 176224712.

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 217422671 - 2¹⁸ = 217160527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217422679) 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, 18905 + ... + 28146.

It is an arithmetic number, because the mean of its divisors is an integer number (54368586).

Almost surely, 2^217422671 is an apocalyptic number.

217422671 is a deficient number, since it is larger than the sum of its proper divisors (51673).

217422671 is an equidigital number, since it uses as much as digits as its factorization.

217422671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51672.

The product of its digits is 9408, while the sum is 32.

The square root of 217422671 is about 14745.2592720508. The cubic root of 217422671 is about 601.3144064199.

The spelling of 217422671 in words is "two hundred seventeen million, four hundred twenty-two thousand, six hundred seventy-one".