215223205357 has 2 divisors, whose sum is σ = 215223205358. Its totient is φ = 215223205356.

The previous prime is 215223205339. The next prime is 215223205363. The reversal of 215223205357 is 753502322512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166638669796 + 48584535561 = 408214^2 + 220419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215223205357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215223205397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107611602678 + 107611602679.

It is an arithmetic number, because the mean of its divisors is an integer number (107611602679).

Almost surely, 2^215223205357 is an apocalyptic number.

It is an amenable number.

215223205357 is a deficient number, since it is larger than the sum of its proper divisors (1).

215223205357 is an equidigital number, since it uses as much as digits as its factorization.

215223205357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 37.

Adding to 215223205357 its reverse (753502322512), we get a palindrome (968725527869).

The spelling of 215223205357 in words is "two hundred fifteen billion, two hundred twenty-three million, two hundred five thousand, three hundred fifty-seven".