215242213 has 2 divisors, whose sum is σ = 215242214. Its totient is φ = 215242212.

The previous prime is 215242199. The next prime is 215242217. The reversal of 215242213 is 312242512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188430529 + 26811684 = 13727^2 + 5178^2 .

It is a cyclic number.

It is not a de Polignac number, because 215242213 - 2¹³ = 215234021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215242217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107621106 + 107621107.

It is an arithmetic number, because the mean of its divisors is an integer number (107621107).

Almost surely, 2^215242213 is an apocalyptic number.

It is an amenable number.

215242213 is a deficient number, since it is larger than the sum of its proper divisors (1).

215242213 is an equidigital number, since it uses as much as digits as its factorization.

215242213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 22.

The square root of 215242213 is about 14671.1353684710. The cubic root of 215242213 is about 599.2975232353.

Adding to 215242213 its reverse (312242512), we get a palindrome (527484725).

The spelling of 215242213 in words is "two hundred fifteen million, two hundred forty-two thousand, two hundred thirteen".