1211210212209 has 32 divisors (see below), whose sum is σ = 1669522821120. Its totient is φ = 780610632192.

The previous prime is 1211210212207. The next prime is 1211210212229. The reversal of 1211210212209 is 9022120121121.

It is not a de Polignac number, because 1211210212209 - 2¹ = 1211210212207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211210212207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87262332 + ... + 87276210.

It is an arithmetic number, because the mean of its divisors is an integer number (52172588160).

Almost surely, 2^{1211210212209} is an apocalyptic number.

It is an amenable number.

1211210212209 is a deficient number, since it is larger than the sum of its proper divisors (458312608911).

1211210212209 is a wasteful number, since it uses less digits than its factorization.

1211210212209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21469.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 1211210212209 in words is "one trillion, two hundred eleven billion, two hundred ten million, two hundred twelve thousand, two hundred nine".