21300236620 has 96 divisors (see below), whose sum is σ = 49384887552. Its totient is φ = 7667267328.

The previous prime is 21300236611. The next prime is 21300236669. The reversal of 21300236620 is 2663200312.

It is a happy number.

It is a super-3 number, since 3×21300236620³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7187259 + ... + 7190221.

It is an arithmetic number, because the mean of its divisors is an integer number (514425912).

Almost surely, 2^21300236620 is an apocalyptic number.

21300236620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21300236620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24692443776).

21300236620 is an abundant number, since it is smaller than the sum of its proper divisors (28084650932).

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

21300236620 is a wasteful number, since it uses less digits than its factorization.

21300236620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671 (or 3669 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21300236620 its reverse (2663200312), we get a palindrome (23963436932).

The spelling of 21300236620 in words is "twenty-one billion, three hundred million, two hundred thirty-six thousand, six hundred twenty".