212020868077 has 2 divisors, whose sum is σ = 212020868078. Its totient is φ = 212020868076.

The previous prime is 212020868063. The next prime is 212020868089. The reversal of 212020868077 is 770868020212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176644524681 + 35376343396 = 420291^2 + 188086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212020868077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212020868177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010434038 + 106010434039.

It is an arithmetic number, because the mean of its divisors is an integer number (106010434039).

Almost surely, 2^212020868077 is an apocalyptic number.

It is an amenable number.

212020868077 is a deficient number, since it is larger than the sum of its proper divisors (1).

212020868077 is an equidigital number, since it uses as much as digits as its factorization.

212020868077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 43.

Adding to 212020868077 its reverse (770868020212), we get a palindrome (982888888289).

The spelling of 212020868077 in words is "two hundred twelve billion, twenty million, eight hundred sixty-eight thousand, seventy-seven".