21110111020120 has 32 divisors (see below), whose sum is σ = 47738855142000. Its totient is φ = 8401181235328.

The previous prime is 21110111020093. The next prime is 21110111020129. The reversal of 21110111020120 is 2102011101112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110111020120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111020129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339466170 + ... + 1339481929.

Almost surely, 2^{21110111020120} is an apocalyptic number.

21110111020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110111020120 is an abundant number, since it is smaller than the sum of its proper divisors (26628744121880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110111020120 is a wasteful number, since it uses less digits than its factorization.

21110111020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678948307 (or 2678948303 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110111020120 its reverse (2102011101112), we get a palindrome (23212122121232).

The spelling of 21110111020120 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, twenty thousand, one hundred twenty".