216420423 has 4 divisors (see below), whose sum is σ = 288560568. Its totient is φ = 144280280.

The previous prime is 216420403. The next prime is 216420461. The reversal of 216420423 is 324024612.

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

It is a cyclic number.

It is not a de Polignac number, because 216420423 - 2⁸ = 216420167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216420393 and 216420402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216420403) 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 in 3 ways as a sum of consecutive naturals, for example, 36070068 + ... + 36070073.

It is an arithmetic number, because the mean of its divisors is an integer number (72140142).

Almost surely, 2^216420423 is an apocalyptic number.

216420423 is a deficient number, since it is larger than the sum of its proper divisors (72140145).

216420423 is an equidigital number, since it uses as much as digits as its factorization.

216420423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72140144.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 216420423 is about 14711.2345844936. The cubic root of 216420423 is about 600.3890282627.

The spelling of 216420423 in words is "two hundred sixteen million, four hundred twenty thousand, four hundred twenty-three".