21365413241 has 4 divisors (see below), whose sum is σ = 21403771812. Its totient is φ = 21327054672.

The previous prime is 21365413193. The next prime is 21365413261. The reversal of 21365413241 is 14231456312.

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 5666325625 + 15699087616 = 75275^2 + 125296^2 .

It is a cyclic number.

It is not a de Polignac number, because 21365413241 - 2¹⁰ = 21365412217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21365413198 and 21365413207.

It is not an unprimeable number, because it can be changed into a prime (21365413261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19178450 + ... + 19179563.

It is an arithmetic number, because the mean of its divisors is an integer number (5350942953).

Almost surely, 2^21365413241 is an apocalyptic number.

It is an amenable number.

21365413241 is a deficient number, since it is larger than the sum of its proper divisors (38358571).

21365413241 is an equidigital number, since it uses as much as digits as its factorization.

21365413241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38358570.

The product of its digits is 17280, while the sum is 32.

Adding to 21365413241 its reverse (14231456312), we get a palindrome (35596869553).

The spelling of 21365413241 in words is "twenty-one billion, three hundred sixty-five million, four hundred thirteen thousand, two hundred forty-one".