216534421671 has 8 divisors (see below), whose sum is σ = 303907960320. Its totient is φ = 136758582072.

The previous prime is 216534421669. The next prime is 216534421711. The reversal of 216534421671 is 176124435612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216534421671 - 2¹ = 216534421669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216534421651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1899424695 + ... + 1899424808.

It is an arithmetic number, because the mean of its divisors is an integer number (37988495040).

Almost surely, 2^216534421671 is an apocalyptic number.

216534421671 is a deficient number, since it is larger than the sum of its proper divisors (87373538649).

216534421671 is a wasteful number, since it uses less digits than its factorization.

216534421671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798849525.

The product of its digits is 241920, while the sum is 42.

The spelling of 216534421671 in words is "two hundred sixteen billion, five hundred thirty-four million, four hundred twenty-one thousand, six hundred seventy-one".