212108489 has 2 divisors, whose sum is σ = 212108490. Its totient is φ = 212108488.

The previous prime is 212108471. The next prime is 212108497. The reversal of 212108489 is 984801212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177768889 + 34339600 = 13333^2 + 5860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212108489 is a prime.

It is a super-2 number, since 2×212108489² = 89980022211726242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212108459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106054244 + 106054245.

It is an arithmetic number, because the mean of its divisors is an integer number (106054245).

Almost surely, 2^212108489 is an apocalyptic number.

It is an amenable number.

212108489 is a deficient number, since it is larger than the sum of its proper divisors (1).

212108489 is an equidigital number, since it uses as much as digits as its factorization.

212108489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 212108489 is about 14563.9448296126. The cubic root of 212108489 is about 596.3748908234.

The spelling of 212108489 in words is "two hundred twelve million, one hundred eight thousand, four hundred eighty-nine".