21331132241 has 4 divisors (see below), whose sum is σ = 21331465584. Its totient is φ = 21330798900.

The previous prime is 21331132231. The next prime is 21331132247. The reversal of 21331132241 is 14223113312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331132241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21331132247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37115 + ... + 209856.

It is an arithmetic number, because the mean of its divisors is an integer number (5332866396).

Almost surely, 2^21331132241 is an apocalyptic number.

It is an amenable number.

21331132241 is a deficient number, since it is larger than the sum of its proper divisors (333343).

21331132241 is an equidigital number, since it uses as much as digits as its factorization.

21331132241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333342.

The product of its digits is 864, while the sum is 23.

Adding to 21331132241 its reverse (14223113312), we get a palindrome (35554245553).

The spelling of 21331132241 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty-two thousand, two hundred forty-one".