212320013 has 4 divisors (see below), whose sum is σ = 212528988. Its totient is φ = 212111040.

The previous prime is 212320007. The next prime is 212320019. The reversal of 212320013 is 310023212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212320007) and next prime (212320019).

It can be written as a sum of positive squares in 2 ways, for example, as 84584809 + 127735204 = 9197^2 + 11302^2 .

It is a cyclic number.

It is not a de Polignac number, because 212320013 - 2¹⁶ = 212254477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212320019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102956 + ... + 104997.

It is an arithmetic number, because the mean of its divisors is an integer number (53132247).

Almost surely, 2^212320013 is an apocalyptic number.

It is an amenable number.

212320013 is a deficient number, since it is larger than the sum of its proper divisors (208975).

212320013 is a wasteful number, since it uses less digits than its factorization.

212320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208974.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 212320013 is about 14571.2049261549. The cubic root of 212320013 is about 596.5730687981.

Adding to 212320013 its reverse (310023212), we get a palindrome (522343225).

The spelling of 212320013 in words is "two hundred twelve million, three hundred twenty thousand, thirteen".