131212213 has 4 divisors (see below), whose sum is σ = 143140608. Its totient is φ = 119283820.

The previous prime is 131212199. The next prime is 131212223. The reversal of 131212213 is 312212131.

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 a de Polignac number, because none of the positive numbers 2^k-131212213 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 (131212223) 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, 5964181 + ... + 5964202.

It is an arithmetic number, because the mean of its divisors is an integer number (35785152).

Almost surely, 2^131212213 is an apocalyptic number.

It is an amenable number.

131212213 is a deficient number, since it is larger than the sum of its proper divisors (11928395).

131212213 is a wasteful number, since it uses less digits than its factorization.

131212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11928394.

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

The square root of 131212213 is about 11454.7899587902. The cubic root of 131212213 is about 508.1494034798.

Adding to 131212213 its reverse (312212131), we get a palindrome (443424344).

The spelling of 131212213 in words is "one hundred thirty-one million, two hundred twelve thousand, two hundred thirteen".