201012211909 has 2 divisors, whose sum is σ = 201012211910. Its totient is φ = 201012211908.

The previous prime is 201012211781. The next prime is 201012211949. The reversal of 201012211909 is 909112210102.

201012211909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199402437025 + 1609774884 = 446545^2 + 40122^2 .

It is a cyclic number.

It is not a de Polignac number, because 201012211909 - 2⁷ = 201012211781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201012211949) 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, 100506105954 + 100506105955.

It is an arithmetic number, because the mean of its divisors is an integer number (100506105955).

Almost surely, 2^201012211909 is an apocalyptic number.

It is an amenable number.

201012211909 is a deficient number, since it is larger than the sum of its proper divisors (1).

201012211909 is an equidigital number, since it uses as much as digits as its factorization.

201012211909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 201012211909 in words is "two hundred one billion, twelve million, two hundred eleven thousand, nine hundred nine".