21030330123305 has 8 divisors (see below), whose sum is σ = 25236430741512. Its totient is φ = 16824241036288.

The previous prime is 21030330123293. The next prime is 21030330123331. The reversal of 21030330123305 is 50332103303012.

It can be written as a sum of positive squares in 4 ways, for example, as 2113371617536 + 18916958505769 = 1453744^2 + 4349363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030330123305 - 2²² = 21030325929001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1829897 + ... + 6738633.

It is an arithmetic number, because the mean of its divisors is an integer number (3154553842689).

Almost surely, 2^{21030330123305} is an apocalyptic number.

It is an amenable number.

21030330123305 is a deficient number, since it is larger than the sum of its proper divisors (4206100618207).

21030330123305 is an equidigital number, since it uses as much as digits as its factorization.

21030330123305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765595.

The product of its (nonzero) digits is 4860, while the sum is 26.

Adding to 21030330123305 its reverse (50332103303012), we get a palindrome (71362433426317).

The spelling of 21030330123305 in words is "twenty-one trillion, thirty billion, three hundred thirty million, one hundred twenty-three thousand, three hundred five".