213112213 has 4 divisors (see below), whose sum is σ = 220460940. Its totient is φ = 205763488.

The previous prime is 213112177. The next prime is 213112247. The reversal of 213112213 is 312211312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113252164 + 99860049 = 10642^2 + 9993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213112213 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 (213112283) 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, 3674320 + ... + 3674377.

It is an arithmetic number, because the mean of its divisors is an integer number (55115235).

Almost surely, 2^213112213 is an apocalyptic number.

It is an amenable number.

213112213 is a deficient number, since it is larger than the sum of its proper divisors (7348727).

213112213 is an equidigital number, since it uses as much as digits as its factorization.

213112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348726.

The product of its digits is 72, while the sum is 16.

The square root of 213112213 is about 14598.3633671724. The cubic root of 213112213 is about 597.3141178169.

Adding to 213112213 its reverse (312211312), we get a palindrome (525323525).

Subtracting 213112213 from its reverse (312211312), we obtain a palindrome (99099099).

The spelling of 213112213 in words is "two hundred thirteen million, one hundred twelve thousand, two hundred thirteen".