216420466 has 4 divisors (see below), whose sum is σ = 324630702. Its totient is φ = 108210232.

The previous prime is 216420461. The next prime is 216420473. The reversal of 216420466 is 664024612.

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

It can be written as a sum of positive squares in only one way, i.e., 171060241 + 45360225 = 13079^2 + 6735^2 .

It is not an unprimeable number, because it can be changed into a prime (216420461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54105115 + ... + 54105118.

Almost surely, 2^216420466 is an apocalyptic number.

216420466 is a deficient number, since it is larger than the sum of its proper divisors (108210236).

216420466 is a wasteful number, since it uses less digits than its factorization.

216420466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108210235.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 216420466 is about 14711.2360459616. The cubic root of 216420466 is about 600.3890680260.

The spelling of 216420466 in words is "two hundred sixteen million, four hundred twenty thousand, four hundred sixty-six".