212817856204823 has 2 divisors, whose sum is σ = 212817856204824. Its totient is φ = 212817856204822.

The previous prime is 212817856204781. The next prime is 212817856204847. The reversal of 212817856204823 is 328402658718212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212817856204823 - 2³⁶ = 212749136728087 is a prime.

It is a super-2 number, since 2×212817856204823² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212817859204823) 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, 106408928102411 + 106408928102412.

It is an arithmetic number, because the mean of its divisors is an integer number (106408928102412).

Almost surely, 2^{212817856204823} is an apocalyptic number.

212817856204823 is a deficient number, since it is larger than the sum of its proper divisors (1).

212817856204823 is an equidigital number, since it uses as much as digits as its factorization.

212817856204823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20643840, while the sum is 59.

The spelling of 212817856204823 in words is "two hundred twelve trillion, eight hundred seventeen billion, eight hundred fifty-six million, two hundred four thousand, eight hundred twenty-three".