131216212 has 6 divisors (see below), whose sum is σ = 229628378. Its totient is φ = 65608104.

The previous prime is 131216201. The next prime is 131216231. The reversal of 131216212 is 212612131.

It can be written as a sum of positive squares in only one way, i.e., 123565456 + 7650756 = 11116^2 + 2766^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131216212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16402023 + ... + 16402030.

Almost surely, 2^131216212 is an apocalyptic number.

It is an amenable number.

131216212 is a deficient number, since it is larger than the sum of its proper divisors (98412166).

131216212 is a wasteful number, since it uses less digits than its factorization.

131216212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32804057 (or 32804055 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 131216212 is about 11454.9645132580. The cubic root of 131216212 is about 508.1545657758.

Adding to 131216212 its reverse (212612131), we get a palindrome (343828343).

The spelling of 131216212 in words is "one hundred thirty-one million, two hundred sixteen thousand, two hundred twelve".