12201212111 has 4 divisors (see below), whose sum is σ = 13310413224. Its totient is φ = 11092011000.

The previous prime is 12201212087. The next prime is 12201212113. The reversal of 12201212111 is 11121210221.

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 12201212111 - 2³⁰ = 11127470287 is a prime.

It is a super-2 number, since 2×12201212111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201212113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554600540 + ... + 554600561.

It is an arithmetic number, because the mean of its divisors is an integer number (3327603306).

Almost surely, 2^12201212111 is an apocalyptic number.

12201212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12201212111 is a deficient number, since it is larger than the sum of its proper divisors (1109201113).

12201212111 is a wasteful number, since it uses less digits than its factorization.

12201212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109201112.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12201212111 its reverse (11121210221), we get a palindrome (23322422332).

The spelling of 12201212111 in words is "twelve billion, two hundred one million, two hundred twelve thousand, one hundred eleven".