201212111211 has 4 divisors (see below), whose sum is σ = 268282814952. Its totient is φ = 134141407472.

The previous prime is 201212111209. The next prime is 201212111267. The reversal of 201212111211 is 112111212102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201212111211 - 2¹ = 201212111209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201212111011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33535351866 + ... + 33535351871.

It is an arithmetic number, because the mean of its divisors is an integer number (67070703738).

Almost surely, 2^201212111211 is an apocalyptic number.

201212111211 is a deficient number, since it is larger than the sum of its proper divisors (67070703741).

201212111211 is an equidigital number, since it uses as much as digits as its factorization.

201212111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67070703740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201212111211 its reverse (112111212102), we get a palindrome (313323323313).

The spelling of 201212111211 in words is "two hundred one billion, two hundred twelve million, one hundred eleven thousand, two hundred eleven".