212011120199909 has 2 divisors, whose sum is σ = 212011120199910. Its totient is φ = 212011120199908.

The previous prime is 212011120199869. The next prime is 212011120199927. The reversal of 212011120199909 is 909991021110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170450728039684 + 41560392160225 = 13055678^2 + 6446735^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011120199909 - 2¹² = 212011120195813 is a prime.

It is a super-2 number, since 2×212011120199909² (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 (212011120199999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005560099954 + 106005560099955.

It is an arithmetic number, because the mean of its divisors is an integer number (106005560099955).

Almost surely, 2^{212011120199909} is an apocalyptic number.

It is an amenable number.

212011120199909 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011120199909 is an equidigital number, since it uses as much as digits as its factorization.

212011120199909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 212011120199909 in words is "two hundred twelve trillion, eleven billion, one hundred twenty million, one hundred ninety-nine thousand, nine hundred nine".