21120020100120 has 32 divisors (see below), whose sum is σ = 63360060300720. Its totient is φ = 5632005360000.

The previous prime is 21120020100103. The next prime is 21120020100161. The reversal of 21120020100120 is 2100102002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21120020100096 and 21120020100105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88000083631 + ... + 88000083870.

Almost surely, 2^{21120020100120} is an apocalyptic number.

21120020100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120020100120 is an abundant number, since it is smaller than the sum of its proper divisors (42240040200600).

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

21120020100120 is a wasteful number, since it uses less digits than its factorization.

21120020100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176000167515 (or 176000167511 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120020100120 its reverse (2100102002112), we get a palindrome (23220122102232).

The spelling of 21120020100120 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one hundred thousand, one hundred twenty".