21113120120 has 32 divisors (see below), whose sum is σ = 47628587520. Its totient is φ = 8423191680.

The previous prime is 21113120117. The next prime is 21113120129. The reversal of 21113120120 is 2102131112.

It is a junction number, because it is equal to n+sod(n) for n = 21113120095 and 21113120104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113120129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673751 + ... + 704390.

It is an arithmetic number, because the mean of its divisors is an integer number (1488393360).

Almost surely, 2^21113120120 is an apocalyptic number.

21113120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113120120 is an abundant number, since it is smaller than the sum of its proper divisors (26515467400).

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

21113120120 is a wasteful number, since it uses less digits than its factorization.

21113120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378535 (or 1378531 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21113120120 its reverse (2102131112), we get a palindrome (23215251232).

The spelling of 21113120120 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, one hundred twenty".