212100020000009 has 2 divisors, whose sum is σ = 212100020000010. Its totient is φ = 212100020000008.

The previous prime is 212100019999991. The next prime is 212100020000119. The reversal of 212100020000009 is 900000020001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111441740220409 + 100658279779600 = 10556597^2 + 10032860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100020000009 is a prime.

It is not a weakly prime, because it can be changed into another prime (212100020060009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050010000004 + 106050010000005.

It is an arithmetic number, because the mean of its divisors is an integer number (106050010000005).

Almost surely, 2^{212100020000009} is an apocalyptic number.

It is an amenable number.

212100020000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100020000009 is an equidigital number, since it uses as much as digits as its factorization.

212100020000009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 212100020000009 in words is "two hundred twelve trillion, one hundred billion, twenty million, nine", and thus it is an aban number.