212255231917 has 2 divisors, whose sum is σ = 212255231918. Its totient is φ = 212255231916.

The previous prime is 212255231891. The next prime is 212255232017. The reversal of 212255231917 is 719132552212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178676135401 + 33579096516 = 422701^2 + 183246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212255231917 is a prime.

It is a super-2 number, since 2×212255231917² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212255231917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212255231017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106127615958 + 106127615959.

It is an arithmetic number, because the mean of its divisors is an integer number (106127615959).

Almost surely, 2^212255231917 is an apocalyptic number.

It is an amenable number.

212255231917 is a deficient number, since it is larger than the sum of its proper divisors (1).

212255231917 is an equidigital number, since it uses as much as digits as its factorization.

212255231917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The spelling of 212255231917 in words is "two hundred twelve billion, two hundred fifty-five million, two hundred thirty-one thousand, nine hundred seventeen".