215122247 has 2 divisors, whose sum is σ = 215122248. Its totient is φ = 215122246.

The previous prime is 215122217. The next prime is 215122273. The reversal of 215122247 is 742221512.

It is an a-pointer prime, because the next prime (215122273) can be obtained adding 215122247 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215122247 - 2⁶ = 215122183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215122207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107561123 + 107561124.

It is an arithmetic number, because the mean of its divisors is an integer number (107561124).

Almost surely, 2^215122247 is an apocalyptic number.

215122247 is a deficient number, since it is larger than the sum of its proper divisors (1).

215122247 is an equidigital number, since it uses as much as digits as its factorization.

215122247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 26.

The square root of 215122247 is about 14667.0462943293. The cubic root of 215122247 is about 599.1861623537.

Adding to 215122247 its reverse (742221512), we get a palindrome (957343759).

The spelling of 215122247 in words is "two hundred fifteen million, one hundred twenty-two thousand, two hundred forty-seven".