212102011121989 has 2 divisors, whose sum is σ = 212102011121990. Its totient is φ = 212102011121988.

The previous prime is 212102011121953. The next prime is 212102011122047. The reversal of 212102011121989 is 989121110201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211191608899489 + 910402222500 = 14532433^2 + 954150^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102011121989 - 2⁴⁷ = 71364522766661 is a prime.

It is a super-2 number, since 2×212102011121989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212102011121909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051005560994 + 106051005560995.

It is an arithmetic number, because the mean of its divisors is an integer number (106051005560995).

Almost surely, 2^{212102011121989} is an apocalyptic number.

It is an amenable number.

212102011121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102011121989 is an equidigital number, since it uses as much as digits as its factorization.

212102011121989 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 40.

The spelling of 212102011121989 in words is "two hundred twelve trillion, one hundred two billion, eleven million, one hundred twenty-one thousand, nine hundred eighty-nine".