21530333241 has 24 divisors (see below), whose sum is σ = 31482706944. Its totient is φ = 14177630880.

The previous prime is 21530333233. The next prime is 21530333257. The reversal of 21530333241 is 14233303512.

21530333241 is a `hidden beast` number, since 21 + 5 + 303 + 332 + 4 + 1 = 666.

It is not a de Polignac number, because 21530333241 - 2³ = 21530333233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21530333291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217971 + ... + 300951.

It is an arithmetic number, because the mean of its divisors is an integer number (1311779456).

Almost surely, 2^21530333241 is an apocalyptic number.

It is an amenable number.

21530333241 is a deficient number, since it is larger than the sum of its proper divisors (9952373703).

21530333241 is a wasteful number, since it uses less digits than its factorization.

21530333241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83341 (or 83338 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21530333241 its reverse (14233303512), we get a palindrome (35763636753).

The spelling of 21530333241 in words is "twenty-one billion, five hundred thirty million, three hundred thirty-three thousand, two hundred forty-one".