21232105441 has 4 divisors (see below), whose sum is σ = 21244618692. Its totient is φ = 21219592192.

The previous prime is 21232105429. The next prime is 21232105451. The reversal of 21232105441 is 14450123212.

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 20602296225 + 629809216 = 143535^2 + 25096^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232105441 - 2¹¹ = 21232103393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232105451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6254080 + ... + 6257473.

It is an arithmetic number, because the mean of its divisors is an integer number (5311154673).

Almost surely, 2^21232105441 is an apocalyptic number.

It is an amenable number.

21232105441 is a deficient number, since it is larger than the sum of its proper divisors (12513251).

21232105441 is a wasteful number, since it uses less digits than its factorization.

21232105441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12513250.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21232105441 its reverse (14450123212), we get a palindrome (35682228653).

The spelling of 21232105441 in words is "twenty-one billion, two hundred thirty-two million, one hundred five thousand, four hundred forty-one".