21110110120 has 48 divisors (see below), whose sum is σ = 52208280180. Its totient is φ = 7676401920.

The previous prime is 21110110103. The next prime is 21110110139. The reversal of 21110110120 is 2101101112.

It can be written as a sum of positive squares in 2 ways, for example, as 19252672516 + 1857437604 = 138754^2 + 43098^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21110110097 and 21110110106.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2175957 + ... + 2185636.

Almost surely, 2^21110110120 is an apocalyptic number.

21110110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110110120 is an abundant number, since it is smaller than the sum of its proper divisors (31098170060).

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

21110110120 is a wasteful number, since it uses less digits than its factorization.

21110110120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4361626 (or 4361611 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21110110120 its reverse (2101101112), we get a palindrome (23211211232).

The spelling of 21110110120 in words is "twenty-one billion, one hundred ten million, one hundred ten thousand, one hundred twenty".