21330243441 has 24 divisors (see below), whose sum is σ = 33248045376. Its totient is φ = 13099534560.

The previous prime is 21330243437. The next prime is 21330243491. The reversal of 21330243441 is 14434203312.

21330243441 is a `hidden beast` number, since 2 + 13 + 302 + 4 + 344 + 1 = 666.

It is not a de Polignac number, because 21330243441 - 2² = 21330243437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330243491) 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, 128205 + ... + 243098.

It is an arithmetic number, because the mean of its divisors is an integer number (1385335224).

Almost surely, 2^21330243441 is an apocalyptic number.

It is an amenable number.

21330243441 is a deficient number, since it is larger than the sum of its proper divisors (11917801935).

21330243441 is a wasteful number, since it uses less digits than its factorization.

21330243441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371813 (or 371810 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21330243441 its reverse (14434203312), we get a palindrome (35764446753).

The spelling of 21330243441 in words is "twenty-one billion, three hundred thirty million, two hundred forty-three thousand, four hundred forty-one".