21120100021968 has 40 divisors (see below), whose sum is σ = 54561966888000. Its totient is φ = 7039812889344.

The previous prime is 21120100021967. The next prime is 21120100022009. The reversal of 21120100021968 is 86912000102112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120100021963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5336668 + ... + 8409531.

It is an arithmetic number, because the mean of its divisors is an integer number (1364049172200).

Almost surely, 2^{21120100021968} is an apocalyptic number.

It is an amenable number.

21120100021968 is an abundant number, since it is smaller than the sum of its proper divisors (33441866866032).

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

21120100021968 is a wasteful number, since it uses less digits than its factorization.

21120100021968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778219 (or 13778213 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 21120100021968 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, twenty-one thousand, nine hundred sixty-eight".