2111212001209 has 2 divisors, whose sum is σ = 2111212001210. Its totient is φ = 2111212001208.

The previous prime is 2111212001203. The next prime is 2111212001251. The reversal of 2111212001209 is 9021002121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876886300025 + 234325701184 = 1369995^2 + 484072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111212001209 - 2⁹ = 2111212000697 is a prime.

It is a super-2 number, since 2×2111212001209² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2111212001209.

It is not a weakly prime, because it can be changed into another prime (2111212001203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055606000604 + 1055606000605.

It is an arithmetic number, because the mean of its divisors is an integer number (1055606000605).

Almost surely, 2^{2111212001209} is an apocalyptic number.

It is an amenable number.

2111212001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111212001209 is an equidigital number, since it uses as much as digits as its factorization.

2111212001209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 2111212001209 in words is "two trillion, one hundred eleven billion, two hundred twelve million, one thousand, two hundred nine".