21432321241 has 4 divisors (see below), whose sum is σ = 21435408000. Its totient is φ = 21429234484.

The previous prime is 21432321227. The next prime is 21432321257. The reversal of 21432321241 is 14212323412.

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-21432321241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432321221) 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, 1532941 + ... + 1546858.

It is an arithmetic number, because the mean of its divisors is an integer number (5358852000).

Almost surely, 2^21432321241 is an apocalyptic number.

It is an amenable number.

21432321241 is a deficient number, since it is larger than the sum of its proper divisors (3086759).

21432321241 is an equidigital number, since it uses as much as digits as its factorization.

21432321241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086758.

The product of its digits is 2304, while the sum is 25.

Adding to 21432321241 its reverse (14212323412), we get a palindrome (35644644653).

The spelling of 21432321241 in words is "twenty-one billion, four hundred thirty-two million, three hundred twenty-one thousand, two hundred forty-one".