216203240 has 32 divisors (see below), whose sum is σ = 530681760. Its totient is φ = 78619200.

The previous prime is 216203231. The next prime is 216203249. The reversal of 216203240 is 42302612.

It is an interprime number because it is at equal distance from previous prime (216203231) and next prime (216203249).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (216203249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245246 + ... + 246125.

It is an arithmetic number, because the mean of its divisors is an integer number (16583805).

Almost surely, 2^216203240 is an apocalyptic number.

216203240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216203240 is an abundant number, since it is smaller than the sum of its proper divisors (314478520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216203240 is a wasteful number, since it uses less digits than its factorization.

216203240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491393 (or 491389 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 216203240 is about 14703.8511962003. The cubic root of 216203240 is about 600.1881261932.

Adding to 216203240 its reverse (42302612), we get a palindrome (258505852).

The spelling of 216203240 in words is "two hundred sixteen million, two hundred three thousand, two hundred forty".