212243513 has 4 divisors (see below), whose sum is σ = 212273700. Its totient is φ = 212213328.

The previous prime is 212243483. The next prime is 212243519. The reversal of 212243513 is 315342212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22024249 + 190219264 = 4693^2 + 13792^2 .

It is a cyclic number.

It is not a de Polignac number, because 212243513 - 2¹⁰ = 212242489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212243519) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1631 + ... + 20667.

It is an arithmetic number, because the mean of its divisors is an integer number (53068425).

Almost surely, 2^212243513 is an apocalyptic number.

It is an amenable number.

212243513 is a deficient number, since it is larger than the sum of its proper divisors (30187).

212243513 is a wasteful number, since it uses less digits than its factorization.

212243513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30186.

The product of its digits is 1440, while the sum is 23.

The square root of 212243513 is about 14568.5796493687. The cubic root of 212243513 is about 596.5014107360.

Adding to 212243513 its reverse (315342212), we get a palindrome (527585725).

The spelling of 212243513 in words is "two hundred twelve million, two hundred forty-three thousand, five hundred thirteen".