21120718992 has 40 divisors (see below), whose sum is σ = 55486642080. Its totient is φ = 6920912640.

The previous prime is 21120718939. The next prime is 21120719023. The reversal of 21120718992 is 29981702112.

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, 3726109 + ... + 3731772.

It is an arithmetic number, because the mean of its divisors is an integer number (1387166052).

Almost surely, 2^21120718992 is an apocalyptic number.

It is an amenable number.

21120718992 is an abundant number, since it is smaller than the sum of its proper divisors (34365923088).

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

21120718992 is a wasteful number, since it uses less digits than its factorization.

21120718992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7457951 (or 7457945 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 21120718992 in words is "twenty-one billion, one hundred twenty million, seven hundred eighteen thousand, nine hundred ninety-two".