213203240 has 32 divisors (see below), whose sum is σ = 482210280. Its totient is φ = 84836352.

The previous prime is 213203219. The next prime is 213203257. The reversal of 213203240 is 42302312.

It can be written as a sum of positive squares in 4 ways, for example, as 66357316 + 146845924 = 8146^2 + 12118^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6089 + ... + 21528.

Almost surely, 2^213203240 is an apocalyptic number.

213203240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213203240 is an abundant number, since it is smaller than the sum of its proper divisors (269007040).

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

213203240 is a wasteful number, since it uses less digits than its factorization.

213203240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27821 (or 27817 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 213203240 is about 14601.4807468284. The cubic root of 213203240 is about 597.3991496600.

Adding to 213203240 its reverse (42302312), we get a palindrome (255505552).

The spelling of 213203240 in words is "two hundred thirteen million, two hundred three thousand, two hundred forty".