212001122109989 has 2 divisors, whose sum is σ = 212001122109990. Its totient is φ = 212001122109988.

The previous prime is 212001122109983. The next prime is 212001122110021. The reversal of 212001122109989 is 989901221100212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188800186049764 + 23200936060225 = 13740458^2 + 4816735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212001122109989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212001122109983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000561054994 + 106000561054995.

It is an arithmetic number, because the mean of its divisors is an integer number (106000561054995).

Almost surely, 2^{212001122109989} is an apocalyptic number.

It is an amenable number.

212001122109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001122109989 is an equidigital number, since it uses as much as digits as its factorization.

212001122109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 212001122109989 in words is "two hundred twelve trillion, one billion, one hundred twenty-two million, one hundred nine thousand, nine hundred eighty-nine".