21101020000120 has 48 divisors (see below), whose sum is σ = 49058224787880. Its totient is φ = 8168136759360.

The previous prime is 21101020000097. The next prime is 21101020000141. The reversal of 21101020000120 is 2100002010112.

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 = 21101020000097 and 21101020000106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274428522 + ... + 274505401.

Almost surely, 2^{21101020000120} is an apocalyptic number.

21101020000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101020000120 is an abundant number, since it is smaller than the sum of its proper divisors (27957204787760).

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

21101020000120 is a wasteful number, since it uses less digits than its factorization.

21101020000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548933996 (or 548933961 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101020000120 its reverse (2100002010112), we get a palindrome (23201022010232).

The spelling of 21101020000120 in words is "twenty-one trillion, one hundred one billion, twenty million, one hundred twenty", and thus it is an aban number.