1211210111211 has 8 divisors (see below), whose sum is σ = 1637692545024. Its totient is φ = 796100542440.

The previous prime is 1211210111203. The next prime is 1211210111213. The reversal of 1211210111211 is 1121110121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211210111211 - 2³ = 1211210111203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211210111213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2843216011 + ... + 2843216436.

It is an arithmetic number, because the mean of its divisors is an integer number (204711568128).

Almost surely, 2^{1211210111211} is an apocalyptic number.

1211210111211 is a deficient number, since it is larger than the sum of its proper divisors (426482433813).

1211210111211 is an equidigital number, since it uses as much as digits as its factorization.

1211210111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5686432521.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211210111211 its reverse (1121110121121), we get a palindrome (2332320232332).

The spelling of 1211210111211 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred eleven thousand, two hundred eleven".