215223205397 has 2 divisors, whose sum is σ = 215223205398. Its totient is φ = 215223205396.

The previous prime is 215223205363. The next prime is 215223205427. The reversal of 215223205397 is 793502322512.

215223205397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148248870961 + 66974334436 = 385031^2 + 258794^2 .

It is a cyclic number.

It is not a de Polignac number, because 215223205397 - 2¹⁰ = 215223204373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215223205357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107611602698 + 107611602699.

It is an arithmetic number, because the mean of its divisors is an integer number (107611602699).

Almost surely, 2^215223205397 is an apocalyptic number.

It is an amenable number.

215223205397 is a deficient number, since it is larger than the sum of its proper divisors (1).

215223205397 is an equidigital number, since it uses as much as digits as its factorization.

215223205397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 215223205397 in words is "two hundred fifteen billion, two hundred twenty-three million, two hundred five thousand, three hundred ninety-seven".