21280230302500 has 405 divisors, whose sum is σ = 51828803068581. Its totient is φ = 7639210800000.

The previous prime is 21280230302489. The next prime is 21280230302501. The reversal of 21280230302500 is 520303208212.

The square root of 21280230302500 is 4613050.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 21019125654244 + 261104648256 = 4584662^2 + 510984^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21280230302501) by changing a digit.

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 134 ways as a sum of consecutive naturals, for example, 140928677425 + ... + 140928677575.

Almost surely, 2^{21280230302500} is an apocalyptic number.

21280230302500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

21280230302500 is the 4613050-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21280230302500

21280230302500 is an abundant number, since it is smaller than the sum of its proper divisors (30548572766081).

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

21280230302500 is an equidigital number, since it uses as much as digits as its factorization.

21280230302500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 21280230302500 in words is "twenty-one trillion, two hundred eighty billion, two hundred thirty million, three hundred two thousand, five hundred".