216420046 has 4 divisors (see below), whose sum is σ = 324630072. Its totient is φ = 108210022.

The previous prime is 216420023. The next prime is 216420053. The reversal of 216420046 is 640024612.

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 216420046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54105010 + ... + 54105013.

It is an arithmetic number, because the mean of its divisors is an integer number (81157518).

Almost surely, 2^216420046 is an apocalyptic number.

216420046 is a deficient number, since it is larger than the sum of its proper divisors (108210026).

216420046 is a wasteful number, since it uses less digits than its factorization.

216420046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108210025.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 216420046 is about 14711.2217711514. The cubic root of 216420046 is about 600.3886796407.

Adding to 216420046 its reverse (640024612), we get a palindrome (856444658).

The spelling of 216420046 in words is "two hundred sixteen million, four hundred twenty thousand, forty-six".