111210120000021 has 16 divisors (see below), whose sum is σ = 169464283043328. Its totient is φ = 63548173858800.

The previous prime is 111210120000011. The next prime is 111210120000059. The reversal of 111210120000021 is 120000021012111.

It is not a de Polignac number, because 111210120000021 - 2⁵ = 111210119999989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210119999961 and 111210120000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210120000011) 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 15 ways as a sum of consecutive naturals, for example, 16481115 + ... + 22227176.

It is an arithmetic number, because the mean of its divisors is an integer number (10591517690208).

Almost surely, 2^{111210120000021} is an apocalyptic number.

It is an amenable number.

111210120000021 is a deficient number, since it is larger than the sum of its proper divisors (58254163043307).

111210120000021 is a wasteful number, since it uses less digits than its factorization.

111210120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38845112.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111210120000021 its reverse (120000021012111), we get a palindrome (231210141012132).

The spelling of 111210120000021 in words is "one hundred eleven trillion, two hundred ten billion, one hundred twenty million, twenty-one", and thus it is an aban number.