21300020388 has 48 divisors (see below), whose sum is σ = 55230356160. Its totient is φ = 7098967872.

The previous prime is 21300020387. The next prime is 21300020437. The reversal of 21300020388 is 88302000312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21300020387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1191331 + ... + 1209077.

It is an arithmetic number, because the mean of its divisors is an integer number (1150632420).

Almost surely, 2^21300020388 is an apocalyptic number.

It is an amenable number.

21300020388 is an abundant number, since it is smaller than the sum of its proper divisors (33930335772).

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

21300020388 is a wasteful number, since it uses less digits than its factorization.

21300020388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28873 (or 28865 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 21300020388 in words is "twenty-one billion, three hundred million, twenty thousand, three hundred eighty-eight".