21120011100020 has 48 divisors (see below), whose sum is σ = 53355817522560. Its totient is φ = 6860033679744.

The previous prime is 21120011099987. The next prime is 21120011100031. The reversal of 21120011100020 is 2000111002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120011099974 and 21120011100010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3969924239 + ... + 3969929558.

It is an arithmetic number, because the mean of its divisors is an integer number (1111579531720).

Almost surely, 2^{21120011100020} is an apocalyptic number.

21120011100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120011100020 is an abundant number, since it is smaller than the sum of its proper divisors (32235806422540).

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

21120011100020 is a wasteful number, since it uses less digits than its factorization.

21120011100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7939853832 (or 7939853830 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120011100020 its reverse (2000111002112), we get a palindrome (23120122102132).

The spelling of 21120011100020 in words is "twenty-one trillion, one hundred twenty billion, eleven million, one hundred thousand, twenty".