212240069 has 2 divisors, whose sum is σ = 212240070. Its totient is φ = 212240068.

The previous prime is 212240003. The next prime is 212240071. The reversal of 212240069 is 960042212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210627169 + 1612900 = 14513^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 212240069 - 2²⁴ = 195462853 is a prime.

It is a super-2 number, since 2×212240069² = 90091693778249522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 212240071, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212240099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106120034 + 106120035.

It is an arithmetic number, because the mean of its divisors is an integer number (106120035).

Almost surely, 2^212240069 is an apocalyptic number.

It is an amenable number.

212240069 is a deficient number, since it is larger than the sum of its proper divisors (1).

212240069 is an equidigital number, since it uses as much as digits as its factorization.

212240069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 212240069 is about 14568.4614493089. The cubic root of 212240069 is about 596.4981843131.

The spelling of 212240069 in words is "two hundred twelve million, two hundred forty thousand, sixty-nine".