212220247 has 2 divisors, whose sum is σ = 212220248. Its totient is φ = 212220246.

The previous prime is 212220191. The next prime is 212220259. The reversal of 212220247 is 742022212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212220247 - 2⁷ = 212220119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212320247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110123 + 106110124.

It is an arithmetic number, because the mean of its divisors is an integer number (106110124).

Almost surely, 2^212220247 is an apocalyptic number.

212220247 is a deficient number, since it is larger than the sum of its proper divisors (1).

212220247 is an equidigital number, since it uses as much as digits as its factorization.

212220247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 212220247 is about 14567.7811282295. The cubic root of 212220247 is about 596.4796139034.

Adding to 212220247 its reverse (742022212), we get a palindrome (954242459).

The spelling of 212220247 in words is "two hundred twelve million, two hundred twenty thousand, two hundred forty-seven".