201212011111 has 4 divisors (see below), whose sum is σ = 201217110400. Its totient is φ = 201206911824.

The previous prime is 201212011109. The next prime is 201212011123. The reversal of 201212011111 is 111110212102.

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 201212011111 - 2¹ = 201212011109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212011091 and 201212011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212011141) 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, 2489991 + ... + 2569528.

It is an arithmetic number, because the mean of its divisors is an integer number (50304277600).

Almost surely, 2^201212011111 is an apocalyptic number.

201212011111 is a deficient number, since it is larger than the sum of its proper divisors (5099289).

201212011111 is an equidigital number, since it uses as much as digits as its factorization.

201212011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5099288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201212011111 its reverse (111110212102), we get a palindrome (312322223213).

The spelling of 201212011111 in words is "two hundred one billion, two hundred twelve million, eleven thousand, one hundred eleven".