12121212021111 has 24 divisors (see below), whose sum is σ = 17589246030720. Its totient is φ = 8043512020416.

The previous prime is 12121212021073. The next prime is 12121212021119. The reversal of 12121212021111 is 11112021212121.

It is a happy number.

12121212021111 is a `hidden beast` number, since 121 + 212 + 120 + 211 + 1 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12121212021111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121212021119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14997925 + ... + 15785441.

It is an arithmetic number, because the mean of its divisors is an integer number (732885251280).

Almost surely, 2^{12121212021111} is an apocalyptic number.

12121212021111 is a deficient number, since it is larger than the sum of its proper divisors (5468034009609).

12121212021111 is a wasteful number, since it uses less digits than its factorization.

12121212021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795415 (or 795412 counting only the distinct ones).

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

Adding to 12121212021111 its reverse (11112021212121), we get a palindrome (23233233233232).

The spelling of 12121212021111 in words is "twelve trillion, one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred eleven".