12121111112211 has 16 divisors (see below), whose sum is σ = 18134995727520. Its totient is φ = 8000733405600.

The previous prime is 12121111112207. The next prime is 12121111112219. The reversal of 12121111112211 is 11221111112121.

12121111112211 is a `hidden beast` number, since 121 + 211 + 1 + 111 + 221 + 1 = 666.

It is not a de Polignac number, because 12121111112211 - 2² = 12121111112207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121111112219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2222423220 + ... + 2222428673.

It is an arithmetic number, because the mean of its divisors is an integer number (1133437232970).

Almost surely, 2^{12121111112211} is an apocalyptic number.

12121111112211 is a deficient number, since it is larger than the sum of its proper divisors (6013884615309).

12121111112211 is a wasteful number, since it uses less digits than its factorization.

12121111112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444852003 (or 4444851997 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12121111112211 its reverse (11221111112121), we get a palindrome (23342222224332).

The spelling of 12121111112211 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred eleven".