21030200320 has 44 divisors (see below), whose sum is σ = 50447848284. Its totient is φ = 8412078080.

The previous prime is 21030200311. The next prime is 21030200339. The reversal of 21030200320 is 2300203012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4051067904 + 16979132416 = 63648^2 + 130304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21030200320.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048611 + ... + 2058850.

Almost surely, 2^21030200320 is an apocalyptic number.

21030200320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030200320 is an abundant number, since it is smaller than the sum of its proper divisors (29417647964).

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

21030200320 is an equidigital number, since it uses as much as digits as its factorization.

21030200320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107486 (or 4107468 counting only the distinct ones).

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

Adding to 21030200320 its reverse (2300203012), we get a palindrome (23330403332).

The spelling of 21030200320 in words is "twenty-one billion, thirty million, two hundred thousand, three hundred twenty".