213440312 has 32 divisors (see below), whose sum is σ = 406797600. Its totient is φ = 104976000.

The previous prime is 213440267. The next prime is 213440323. The reversal of 213440312 is 213044312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130862 + ... + 132482.

It is an arithmetic number, because the mean of its divisors is an integer number (12712425).

Almost surely, 2^213440312 is an apocalyptic number.

It is an amenable number.

213440312 is a deficient number, since it is larger than the sum of its proper divisors (193357288).

213440312 is a wasteful number, since it uses less digits than its factorization.

213440312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887 (or 1883 counting only the distinct ones).

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

The square root of 213440312 is about 14609.5965721166. The cubic root of 213440312 is about 597.6204942474.

Adding to 213440312 its reverse (213044312), we get a palindrome (426484624).

The spelling of 213440312 in words is "two hundred thirteen million, four hundred forty thousand, three hundred twelve".