212102102077 has 2 divisors, whose sum is σ = 212102102078. Its totient is φ = 212102102076.

The previous prime is 212102102057. The next prime is 212102102099. The reversal of 212102102077 is 770201201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202415408836 + 9686693241 = 449906^2 + 98421^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102102077 - 2⁷ = 212102101949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212102102057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051051038 + 106051051039.

It is an arithmetic number, because the mean of its divisors is an integer number (106051051039).

Almost surely, 2^212102102077 is an apocalyptic number.

It is an amenable number.

212102102077 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102102077 is an equidigital number, since it uses as much as digits as its factorization.

212102102077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 212102102077 its reverse (770201201212), we get a palindrome (982303303289).

The spelling of 212102102077 in words is "two hundred twelve billion, one hundred two million, one hundred two thousand, seventy-seven".