212808765991 has 2 divisors, whose sum is σ = 212808765992. Its totient is φ = 212808765990.

The previous prime is 212808765959. The next prime is 212808766031. The reversal of 212808765991 is 199567808212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212808765991 - 2⁵ = 212808765959 is a prime.

It is a super-2 number, since 2×212808765991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212808765691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106404382995 + 106404382996.

It is an arithmetic number, because the mean of its divisors is an integer number (106404382996).

Almost surely, 2^212808765991 is an apocalyptic number.

212808765991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212808765991 is an equidigital number, since it uses as much as digits as its factorization.

212808765991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 212808765991 in words is "two hundred twelve billion, eight hundred eight million, seven hundred sixty-five thousand, nine hundred ninety-one".