12121222111011 has 48 divisors (see below), whose sum is σ = 19253041918656. Its totient is φ = 7303330925568.

The previous prime is 12121222110973. The next prime is 12121222111021. The reversal of 12121222111011 is 11011122212121.

It is a happy number.

12121222111011 is a `hidden beast` number, since 121 + 212 + 221 + 110 + 1 + 1 = 666.

It is not a de Polignac number, because 12121222111011 - 2⁶ = 12121222110947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121222111021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4009375 + ... + 6349608.

It is an arithmetic number, because the mean of its divisors is an integer number (401105039972).

Almost surely, 2^{12121222111011} is an apocalyptic number.

12121222111011 is a deficient number, since it is larger than the sum of its proper divisors (7131819807645).

12121222111011 is a wasteful number, since it uses less digits than its factorization.

12121222111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359212 (or 10359209 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121222111011 its reverse (11011122212121), we get a palindrome (23132344323132).

The spelling of 12121222111011 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, eleven".