212066585821 has 2 divisors, whose sum is σ = 212066585822. Its totient is φ = 212066585820.

The previous prime is 212066585789. The next prime is 212066585891. The reversal of 212066585821 is 128585660212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146163994596 + 65902591225 = 382314^2 + 256715^2 .

It is a cyclic number.

It is not a de Polignac number, because 212066585821 - 2⁵ = 212066585789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212066585891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106033292910 + 106033292911.

It is an arithmetic number, because the mean of its divisors is an integer number (106033292911).

Almost surely, 2^212066585821 is an apocalyptic number.

It is an amenable number.

212066585821 is a deficient number, since it is larger than the sum of its proper divisors (1).

212066585821 is an equidigital number, since it uses as much as digits as its factorization.

212066585821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 212066585821 in words is "two hundred twelve billion, sixty-six million, five hundred eighty-five thousand, eight hundred twenty-one".