212320247 has 2 divisors, whose sum is σ = 212320248. Its totient is φ = 212320246.

The previous prime is 212320243. The next prime is 212320261. The reversal of 212320247 is 742023212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212320247 - 2² = 212320243 is a prime.

It is a super-2 number, since 2×212320247² = 90159774572282018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212320243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160123 + 106160124.

It is an arithmetic number, because the mean of its divisors is an integer number (106160124).

Almost surely, 2^212320247 is an apocalyptic number.

212320247 is a deficient number, since it is larger than the sum of its proper divisors (1).

212320247 is an equidigital number, since it uses as much as digits as its factorization.

212320247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 212320247 is about 14571.2129556877. The cubic root of 212320247 is about 596.5732879611.

Adding to 212320247 its reverse (742023212), we get a palindrome (954343459).

The spelling of 212320247 in words is "two hundred twelve million, three hundred twenty thousand, two hundred forty-seven".