211110212021209 has 2 divisors, whose sum is σ = 211110212021210. Its totient is φ = 211110212021208.

The previous prime is 211110212021117. The next prime is 211110212021231. The reversal of 211110212021209 is 902120212011112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200269820395584 + 10840391625625 = 14151672^2 + 3292475^2 .

It is a cyclic number.

It is not a de Polignac number, because 211110212021209 - 2⁷ = 211110212021081 is a prime.

It is not a weakly prime, because it can be changed into another prime (211110212021299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555106010604 + 105555106010605.

It is an arithmetic number, because the mean of its divisors is an integer number (105555106010605).

Almost surely, 2^{211110212021209} is an apocalyptic number.

It is an amenable number.

211110212021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

211110212021209 is an equidigital number, since it uses as much as digits as its factorization.

211110212021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 211110212021209 in words is "two hundred eleven trillion, one hundred ten billion, two hundred twelve million, twenty-one thousand, two hundred nine".