21300411505 has 4 divisors (see below), whose sum is σ = 25560493812. Its totient is φ = 17040329200.

The previous prime is 21300411479. The next prime is 21300411533. The reversal of 21300411505 is 50511400312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14263047184 + 7037364321 = 119428^2 + 83889^2 .

It is not a de Polignac number, because 21300411505 - 2²⁹ = 20763540593 is a prime.

It is a Duffinian number.

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, 2130041146 + ... + 2130041155.

It is an arithmetic number, because the mean of its divisors is an integer number (6390123453).

Almost surely, 2^21300411505 is an apocalyptic number.

It is an amenable number.

21300411505 is a deficient number, since it is larger than the sum of its proper divisors (4260082307).

21300411505 is an equidigital number, since it uses as much as digits as its factorization.

21300411505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260082306.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21300411505 its reverse (50511400312), we get a palindrome (71811811817).

The spelling of 21300411505 in words is "twenty-one billion, three hundred million, four hundred eleven thousand, five hundred five".