212421617 has 2 divisors, whose sum is σ = 212421618. Its totient is φ = 212421616.

The previous prime is 212421593. The next prime is 212421667. The reversal of 212421617 is 716124212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 13075456 = 14119^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 212421617 - 2⁸ = 212421361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212421667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210808 + 106210809.

It is an arithmetic number, because the mean of its divisors is an integer number (106210809).

Almost surely, 2^212421617 is an apocalyptic number.

It is an amenable number.

212421617 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421617 is an equidigital number, since it uses as much as digits as its factorization.

212421617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 212421617 is about 14574.6909744255. The cubic root of 212421617 is about 596.6682153381.

Adding to 212421617 its reverse (716124212), we get a palindrome (928545829).

The spelling of 212421617 in words is "two hundred twelve million, four hundred twenty-one thousand, six hundred seventeen".