21300302020 has 12 divisors (see below), whose sum is σ = 44730634284. Its totient is φ = 8520120800.

The previous prime is 21300301993. The next prime is 21300302021. The reversal of 21300302020 is 2020300312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12590186436 + 8710115584 = 112206^2 + 93328^2 .

It is a super-2 number, since 2×21300302020² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21300302021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532507531 + ... + 532507570.

It is an arithmetic number, because the mean of its divisors is an integer number (3727552857).

Almost surely, 2^21300302020 is an apocalyptic number.

21300302020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300302020 is an abundant number, since it is smaller than the sum of its proper divisors (23430332264).

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

21300302020 is a wasteful number, since it uses less digits than its factorization.

21300302020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065015110 (or 1065015108 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21300302020 its reverse (2020300312), we get a palindrome (23320602332).

The spelling of 21300302020 in words is "twenty-one billion, three hundred million, three hundred two thousand, twenty".