21330450241 has 4 divisors (see below), whose sum is σ = 21333001300. Its totient is φ = 21327899184.

The previous prime is 21330450233. The next prime is 21330450257. The reversal of 21330450241 is 14205403312.

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 8899092225 + 12431358016 = 94335^2 + 111496^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330450241 - 2³ = 21330450233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330450041) 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 3 ways as a sum of consecutive naturals, for example, 1262946 + ... + 1279723.

It is an arithmetic number, because the mean of its divisors is an integer number (5333250325).

Almost surely, 2^21330450241 is an apocalyptic number.

It is an amenable number.

21330450241 is a deficient number, since it is larger than the sum of its proper divisors (2551059).

21330450241 is an equidigital number, since it uses as much as digits as its factorization.

21330450241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551058.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21330450241 its reverse (14205403312), we get a palindrome (35535853553).

The spelling of 21330450241 in words is "twenty-one billion, three hundred thirty million, four hundred fifty thousand, two hundred forty-one".