216420334 has 8 divisors (see below), whose sum is σ = 349602120. Its totient is φ = 99886296.

The previous prime is 216420313. The next prime is 216420361. The reversal of 216420334 is 433024612.

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

It is a junction number, because it is equal to n+sod(n) for n = 216420299 and 216420308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4161904 + ... + 4161955.

It is an arithmetic number, because the mean of its divisors is an integer number (43700265).

Almost surely, 2^216420334 is an apocalyptic number.

216420334 is a deficient number, since it is larger than the sum of its proper divisors (133181786).

216420334 is a wasteful number, since it uses less digits than its factorization.

216420334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8323874.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 216420334 is about 14711.2315595942. The cubic root of 216420334 is about 600.3889459621.

Adding to 216420334 its reverse (433024612), we get a palindrome (649444946).

The spelling of 216420334 in words is "two hundred sixteen million, four hundred twenty thousand, three hundred thirty-four".