12111001221111 has 12 divisors (see below), whose sum is σ = 17485705905768. Its totient is φ = 7452923828064.

The previous prime is 12111001221091. The next prime is 12111001221133. The reversal of 12111001221111 is 11112210011121.

It is not a de Polignac number, because 12111001221111 - 2⁶ = 12111001221047 is a prime.

It is a super-2 number, since 2×12111001221111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111001221161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11943787680 + ... + 11943788693.

It is an arithmetic number, because the mean of its divisors is an integer number (1457142158814).

Almost surely, 2^{12111001221111} is an apocalyptic number.

12111001221111 is a deficient number, since it is larger than the sum of its proper divisors (5374704684657).

12111001221111 is a wasteful number, since it uses less digits than its factorization.

12111001221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23887576402 (or 23887576389 counting only the distinct ones).

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

Adding to 12111001221111 its reverse (11112210011121), we get a palindrome (23223211232232).

The spelling of 12111001221111 in words is "twelve trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, one hundred eleven".