211401021989 has 2 divisors, whose sum is σ = 211401021990. Its totient is φ = 211401021988.

The previous prime is 211401021973. The next prime is 211401022013. The reversal of 211401021989 is 989120104112.

211401021989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132381000964 + 79020021025 = 363842^2 + 281105^2 .

It is a cyclic number.

It is not a de Polignac number, because 211401021989 - 2⁴ = 211401021973 is a prime.

It is a super-2 number, since 2×211401021989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211401021959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105700510994 + 105700510995.

It is an arithmetic number, because the mean of its divisors is an integer number (105700510995).

Almost surely, 2^211401021989 is an apocalyptic number.

It is an amenable number.

211401021989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211401021989 is an equidigital number, since it uses as much as digits as its factorization.

211401021989 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 38.

The spelling of 211401021989 in words is "two hundred eleven billion, four hundred one million, twenty-one thousand, nine hundred eighty-nine".