21300020386 has 4 divisors (see below), whose sum is σ = 31950030582. Its totient is φ = 10650010192.

The previous prime is 21300020351. The next prime is 21300020387. The reversal of 21300020386 is 68302000312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14029218025 + 7270802361 = 118445^2 + 85269^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21300020386.

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 as a sum of consecutive naturals, namely, 5325005095 + ... + 5325005098.

Almost surely, 2^21300020386 is an apocalyptic number.

21300020386 is a deficient number, since it is larger than the sum of its proper divisors (10650010196).

21300020386 is a wasteful number, since it uses less digits than its factorization.

21300020386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10650010195.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21300020386 its reverse (68302000312), we get a palindrome (89602020698).

The spelling of 21300020386 in words is "twenty-one billion, three hundred million, twenty thousand, three hundred eighty-six".