213320240 has 40 divisors (see below), whose sum is σ = 566823840. Its totient is φ = 73138176.

The previous prime is 213320203. The next prime is 213320257. The reversal of 213320240 is 42023312.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189905 + ... + 191024.

It is an arithmetic number, because the mean of its divisors is an integer number (14170596).

Almost surely, 2^213320240 is an apocalyptic number.

213320240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213320240 is an abundant number, since it is smaller than the sum of its proper divisors (353503600).

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

213320240 is a wasteful number, since it uses less digits than its factorization.

213320240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380949 (or 380943 counting only the distinct ones).

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

The square root of 213320240 is about 14605.4866403006. The cubic root of 213320240 is about 597.5084083479.

Adding to 213320240 its reverse (42023312), we get a palindrome (255343552).

The spelling of 213320240 in words is "two hundred thirteen million, three hundred twenty thousand, two hundred forty".