216219473 has 4 divisors (see below), whose sum is σ = 216457728. Its totient is φ = 215981220.

The previous prime is 216219469. The next prime is 216219491. The reversal of 216219473 is 374912612.

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 216219473 - 2² = 216219469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216219403) 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, 117761 + ... + 119582.

It is an arithmetic number, because the mean of its divisors is an integer number (54114432).

Almost surely, 2^216219473 is an apocalyptic number.

It is an amenable number.

216219473 is a deficient number, since it is larger than the sum of its proper divisors (238255).

216219473 is an equidigital number, since it uses as much as digits as its factorization.

216219473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238254.

The product of its digits is 18144, while the sum is 35.

The square root of 216219473 is about 14704.4031840806. The cubic root of 216219473 is about 600.2031469518.

The spelling of 216219473 in words is "two hundred sixteen million, two hundred nineteen thousand, four hundred seventy-three".