213126613 has 4 divisors (see below), whose sum is σ = 243573280. Its totient is φ = 182679948.

The previous prime is 213126611. The next prime is 213126631. The reversal of 213126613 is 316621312.

213126613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213126613 - 2¹ = 213126611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213126611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15223323 + ... + 15223336.

It is an arithmetic number, because the mean of its divisors is an integer number (60893320).

Almost surely, 2^213126613 is an apocalyptic number.

It is an amenable number.

213126613 is a deficient number, since it is larger than the sum of its proper divisors (30446667).

213126613 is an equidigital number, since it uses as much as digits as its factorization.

213126613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30446666.

The product of its digits is 1296, while the sum is 25.

The square root of 213126613 is about 14598.8565648136. The cubic root of 213126613 is about 597.3275710261.

Adding to 213126613 its reverse (316621312), we get a palindrome (529747925).

The spelling of 213126613 in words is "two hundred thirteen million, one hundred twenty-six thousand, six hundred thirteen".