21002300320 has 48 divisors (see below), whose sum is σ = 50129496648. Its totient is φ = 8314306560.

The previous prime is 21002300311. The next prime is 21002300321. The reversal of 21002300320 is 2300320012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18481858704 + 2520441616 = 135948^2 + 50204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21002300320.

It is not an unprimeable number, because it can be changed into a prime (21002300321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661101 + ... + 692140.

Almost surely, 2^21002300320 is an apocalyptic number.

21002300320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002300320 is an abundant number, since it is smaller than the sum of its proper divisors (29127196328).

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

21002300320 is a wasteful number, since it uses less digits than its factorization.

21002300320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353353 (or 1353345 counting only the distinct ones).

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

Adding to 21002300320 its reverse (2300320012), we get a palindrome (23302620332).

The spelling of 21002300320 in words is "twenty-one billion, two million, three hundred thousand, three hundred twenty".