216334473 has 4 divisors (see below), whose sum is σ = 288445968.
Its totient is φ = 144222980.
The previous prime is 216334471. The next prime is 216334483. The reversal of 216334473 is 374433612.
It can be divided in two parts, 21633 and 4473, that added together give a triangular number (26106 = T228).
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 216334473 - 21 = 216334471 is a prime.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (216334471) 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, 36055743 + ... + 36055748.
It is an arithmetic number, because the mean of its divisors is an integer number (72111492).
Almost surely, 2216334473 is an apocalyptic number.
It is an amenable number.
216334473 is a deficient number, since it is larger than the sum of its proper divisors (72111495).
216334473 is an equidigital number, since it uses as much as digits as its factorization.
216334473 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 72111494.
The product of its digits is 36288, while the sum is 33.
The square root of 216334473 is about 14708.3130575875.
The cubic root of 216334473 is about 600.3095375056.
The spelling of 216334473 in words is "two hundred sixteen million, three hundred thirty-four thousand, four hundred seventy-three".