20201210999989 has 2 divisors, whose sum is σ = 20201210999990. Its totient is φ = 20201210999988.

The previous prime is 20201210999941. The next prime is 20201211000083. The reversal of 20201210999989 is 98999901210202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12849428852100 + 7351782147889 = 3584610^2 + 2711417^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201210999989 - 2³¹ = 20199063516341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201210991989) 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, 10100605499994 + 10100605499995.

It is an arithmetic number, because the mean of its divisors is an integer number (10100605499995).

Almost surely, 2^{20201210999989} is an apocalyptic number.

It is an amenable number.

20201210999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201210999989 is an equidigital number, since it uses as much as digits as its factorization.

20201210999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 61.

The spelling of 20201210999989 in words is "twenty trillion, two hundred one billion, two hundred ten million, nine hundred ninety-nine thousand, nine hundred eighty-nine".