212102221949 has 2 divisors, whose sum is σ = 212102221950. Its totient is φ = 212102221948.

The previous prime is 212102221943. The next prime is 212102222029. The reversal of 212102221949 is 949122201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139360356100 + 72741865849 = 373310^2 + 269707^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102221949 - 2⁸ = 212102221693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212102221943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051110974 + 106051110975.

It is an arithmetic number, because the mean of its divisors is an integer number (106051110975).

Almost surely, 2^212102221949 is an apocalyptic number.

It is an amenable number.

212102221949 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102221949 is an equidigital number, since it uses as much as digits as its factorization.

212102221949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 212102221949 in words is "two hundred twelve billion, one hundred two million, two hundred twenty-one thousand, nine hundred forty-nine".