120121211111 has 8 divisors (see below), whose sum is σ = 131047040784. Its totient is φ = 109196334720.

The previous prime is 120121211033. The next prime is 120121211143. The reversal of 120121211111 is 111112121021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120121211111 - 2¹⁰ = 120121210087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121211411) 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 7 ways as a sum of consecutive naturals, for example, 39215 + ... + 491711.

It is an arithmetic number, because the mean of its divisors is an integer number (16380880098).

Almost surely, 2^120121211111 is an apocalyptic number.

120121211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

120121211111 is a deficient number, since it is larger than the sum of its proper divisors (10925829673).

120121211111 is a wasteful number, since it uses less digits than its factorization.

120121211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476641.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 120121211111 its reverse (111112121021), we get a palindrome (231233332132).

The spelling of 120121211111 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".