216381603 has 4 divisors (see below), whose sum is σ = 288508808. Its totient is φ = 144254400.

The previous prime is 216381577. The next prime is 216381611. The reversal of 216381603 is 306183612.

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

It is not a de Polignac number, because 216381603 - 2¹⁰ = 216380579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216381623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36063598 + ... + 36063603.

It is an arithmetic number, because the mean of its divisors is an integer number (72127202).

Almost surely, 2^216381603 is an apocalyptic number.

216381603 is a deficient number, since it is larger than the sum of its proper divisors (72127205).

216381603 is an equidigital number, since it uses as much as digits as its factorization.

216381603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72127204.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 216381603 is about 14709.9151255199. The cubic root of 216381603 is about 600.3531282378.

The spelling of 216381603 in words is "two hundred sixteen million, three hundred eighty-one thousand, six hundred three".