212612216213 has 4 divisors (see below), whose sum is σ = 212616401100. Its totient is φ = 212608031328.

The previous prime is 212612216111. The next prime is 212612216221. The reversal of 212612216213 is 312612216212.

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 96844195204 + 115768021009 = 311198^2 + 340247^2 .

It is a cyclic number.

It is not a de Polignac number, because 212612216213 - 2²² = 212608021909 is a prime.

It is a super-2 number, since 2×212612216213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212612216233) 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, 2015288 + ... + 2118161.

It is an arithmetic number, because the mean of its divisors is an integer number (53154100275).

Almost surely, 2^212612216213 is an apocalyptic number.

It is an amenable number.

212612216213 is a deficient number, since it is larger than the sum of its proper divisors (4184887).

212612216213 is an equidigital number, since it uses as much as digits as its factorization.

212612216213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184886.

The product of its digits is 3456, while the sum is 29.

Subtracting 212612216213 from its reverse (312612216212), we obtain a palindrome (99999999999).

The spelling of 212612216213 in words is "two hundred twelve billion, six hundred twelve million, two hundred sixteen thousand, two hundred thirteen".