213122113 has 4 divisors (see below), whose sum is σ = 216041668. Its totient is φ = 210202560.

The previous prime is 213122099. The next prime is 213122137. The reversal of 213122113 is 311221312.

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 126855169 + 86266944 = 11263^2 + 9288^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122113 - 2¹⁷ = 212991041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213122213) 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, 1459668 + ... + 1459813.

It is an arithmetic number, because the mean of its divisors is an integer number (54010417).

Almost surely, 2^213122113 is an apocalyptic number.

It is an amenable number.

213122113 is a deficient number, since it is larger than the sum of its proper divisors (2919555).

213122113 is an equidigital number, since it uses as much as digits as its factorization.

213122113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919554.

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

The square root of 213122113 is about 14598.7024423406. The cubic root of 213122113 is about 597.3233669634.

Adding to 213122113 its reverse (311221312), we get a palindrome (524343425).

The spelling of 213122113 in words is "two hundred thirteen million, one hundred twenty-two thousand, one hundred thirteen".