216422 has 4 divisors (see below), whose sum is σ = 324636. Its totient is φ = 108210.

The previous prime is 216421. The next prime is 216431. The reversal of 216422 is 224612.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 216422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54104 + ... + 54107.

It is an arithmetic number, because the mean of its divisors is an integer number (81159).

2²¹⁶⁴²² is an apocalyptic number.

216422 is a deficient number, since it is larger than the sum of its proper divisors (108214).

216422 is a wasteful number, since it uses less digits than its factorization.

216422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108213.

The product of its digits is 192, while the sum is 17.

The square root of 216422 is about 465.2117797305. The cubic root of 216422 is about 60.0390486553.

The spelling of 216422 in words is "two hundred sixteen thousand, four hundred twenty-two".